dev-amdgpu: Add braces to stop clang compilation braces error
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 <f1eb50f3368ce197c52b19f7fdb5aa7a278f15fd@amd.com>
Maintainer: Matthew Poremba <f1eb50f3368ce197c52b19f7fdb5aa7a278f15fd@amd.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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