dev-amdgpu: Add braces to stop clang compilation braces error

Additional braces are needed due to a clang compilation bug that falsely
throws a "suggest braces around initialization of subject" error. More
info on this bug is available here:
https://stackoverflow.com/questions/31555584

Change-Id: Ide5cdd260716ba06f6da4663732e39d18e00af97
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58150
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Matthew Poremba <matthew.poremba@amd.com>
Tested-by: kokoro <noreply+kokoro@google.com>
1 file changed