[llvm] [AMDGPU] Get rid of the +wavefrontsizeXX,-wavefrontsizeXX in MC tests (PR #99001)

[Stanislav Mekhanoshin via llvm-commits]

rampitec wrote:

And this is literally result of `sed -i` in both directories.

https://github.com/llvm/llvm-project/pull/99001