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/dev/storage/disk_image.hh

@@ -108,7 +108,8 @@ class CowDiskImage : public DiskImage
     static const uint32_t VersionMinor;
 
   protected:
-    struct Sector {
+    struct Sector
+    {
         uint8_t data[SectorSize];
     };
     typedef std::unordered_map<uint64_t, Sector *> SectorTable;

src/dev/storage/ide_atareg.h

@@ -64,7 +64,8 @@
  *             ATA_* : ATA only
  *             ATAPI_* : ATAPI only.
  */
-struct ataparams {
+struct ataparams
+{
     /* drive info */
     uint16_t	atap_config;		/* 0: general configuration */
 #define WDC_CFG_ATAPI_MASK		0xc000