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/sim/dvfs_handler.hh

@@ -223,7 +223,8 @@ class DVFSHandler : public SimObject
      * Update performance level event, encapsulates all the required information
      * for a future call to change a domain's performance level.
      */
-    struct UpdateEvent : public Event {
+    struct UpdateEvent : public Event
+    {
         UpdateEvent() : Event(DVFS_Update_Pri), domainIDToSet(0),
                         perfLevelToSet(0) {}
 

src/sim/mathexpr.hh

@@ -92,7 +92,8 @@ class MathExpr
     // Match operators
     const int MAX_PRIO = 4;
     typedef double (*binOp)(double, double);
-    struct OpSearch {
+    struct OpSearch
+    {
         bool binary;
         Operator op;
         int priority;

src/sim/probe/mem.hh

@@ -50,7 +50,8 @@ namespace ProbePoints {
  * the packet and underlying request can be safely passed on, and
  * consequently modified or even deleted.
  */
-struct PacketInfo {
+struct PacketInfo
+{
     MemCmd cmd;
     Addr addr;
     uint32_t size;