misc: Fix coding style for struct's opening braces

The systemc dir was not included in this fix.

First it was identified that there were only occurrences
at 0, 1, 2 and 3 levels of indentation (and a single
occurrence of 2 and 3 spaces), using:

    grep -nrE --exclude-dir=systemc \
        "^ *struct [A-Za-z].* {$" src/

Then the following commands were run to replace:

<indent level>struct X ... {

by:

<indent level>struct X ...
<indent level>{

Level 0:
    grep -nrl --exclude-dir=systemc
        "^struct [A-Za-z].* {$" src/ | \
        xargs sed -Ei \
        's/^struct ([A-Za-z].*) \{$/struct \1\n\{/g'

Level 1:
    grep -nrl --exclude-dir=systemc \
        "^    struct [A-Za-z].* {$" src/ | \
        xargs sed -Ei \
        's/^    struct ([A-Za-z].*) \{$/    struct \1\n    \{/g'

and so on.

Change-Id: I362ef58c86912dabdd272c7debb8d25d587cd455
Signed-off-by: Daniel R. Carvalho <odanrc@yahoo.com.br>
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/39017
Reviewed-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
Maintainer: Giacomo Travaglini <giacomo.travaglini@arm.com>
Tested-by: kokoro <noreply+kokoro@google.com>

src/mem/cache/prefetch/irregular_stream_buffer.hh

@@ -60,7 +60,8 @@ class IrregularStreamBuffer : public Queued
      * Training Unit Entry datatype, it holds the last accessed address and
      * its secure flag
      */
-    struct TrainingUnitEntry : public TaggedEntry {
+    struct TrainingUnitEntry : public TaggedEntry
+    {
         Addr lastAddress;
         bool lastAddressSecure;
     };
@@ -68,7 +69,8 @@ class IrregularStreamBuffer : public Queued
     AssociativeSet<TrainingUnitEntry> trainingUnit;
 
     /** Address Mapping entry, holds an address and a confidence counter */
-    struct AddressMapping {
+    struct AddressMapping
+    {
         Addr address;
         SatCounter8 counter;
         AddressMapping(unsigned bits) : address(0), counter(bits)

src/mem/cache/prefetch/pif.hh

@@ -71,7 +71,8 @@ class PIF : public Queued
          * The temporal compactor tracks a small number of the
          * most-recently-observed spatial region records.
          */
-        struct CompactorEntry {
+        struct CompactorEntry
+        {
             Addr trigger;
             std::vector<bool> prec;
             std::vector<bool> succ;

src/mem/cache/prefetch/queued.hh

@@ -54,7 +54,8 @@ namespace Prefetcher {
 class Queued : public Base
 {
   protected:
-    struct DeferredPacket : public BaseTLB::Translation {
+    struct DeferredPacket : public BaseTLB::Translation
+    {
         /** Owner of the packet */
         Queued *owner;
         /** Prefetch info corresponding to this packet */

src/mem/cache/prefetch/sbooe.hh

@@ -77,7 +77,8 @@ class SBOOE : public Queued
         /** Holds the current sum of the latency buffer latency */
         Tick latencyBufferSum;
 
-        struct SandboxEntry {
+        struct SandboxEntry
+        {
             /** Cache line predicted by the candidate prefetcher */
             Addr line;
             /** Tick when the simulated prefetch is expected to be filled */

src/mem/cache/prefetch/spatio_temporal_memory_streaming.hh

@@ -65,7 +65,8 @@ class STeMS : public Queued
      * Entry data type for the Active Generation Table (AGT) and the Pattern
      * Sequence Table (PST)
      */
-    struct ActiveGenerationTableEntry : public TaggedEntry {
+    struct ActiveGenerationTableEntry : public TaggedEntry
+    {
         /** Physical address of the spatial region */
         Addr paddress;
         /** PC that started this generation */
@@ -74,7 +75,8 @@ class STeMS : public Queued
         unsigned int seqCounter;
 
         /** Sequence entry data type */
-        struct SequenceEntry {
+        struct SequenceEntry
+        {
             /** 2-bit confidence counter */
             SatCounter8 counter;
             /** Offset, in cache lines, within the spatial region */
@@ -152,7 +154,8 @@ class STeMS : public Queued
     AssociativeSet<ActiveGenerationTableEntry> patternSequenceTable;
 
     /** Data type of the Region Miss Order Buffer entry */
-    struct RegionMissOrderBufferEntry {
+    struct RegionMissOrderBufferEntry
+    {
         /** Address of the spatial region */
         Addr srAddress;
         /**