force GPU_Target to change and running ASAN

[akolliasAMD]

Details

Change so that we force the gpu_targets to have xnack+ when address sanitizer is build

Why were the changes made?
Currently of somebody sets both AMDGPU_TARGETS and GPU_TARGETS Cmake does not force xnack as it is supposed to

Approval Checklist

Do not approve until these items are satisfied.

• [ ] Verify the CHANGELOG has been updated, if
  • there are any NCCL API version changes,
  • any changes impact library users, and/or
  • any changes impact any other ROCm library.