dev-amdgpu: Remove unused variables in src/dev/amdgpu

These were causing errors to be thrown when compiling in clang-12.

Change-Id: I8bd2d7e7e1d4423a54766ed906c864bb91e884f0
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58149
Reviewed-by: Matthew Poremba <matthew.poremba@amd.com>
Maintainer: Matthew Poremba <matthew.poremba@amd.com>
Tested-by: kokoro <noreply+kokoro@google.com>
3 files changed