- Refactored scratch memory handling by introducing fmm_is_scratch_aperture to
replace repeated for-loops.
- Simplified code paths in hsakmt_fmm_release, hsakmt_fmm_map_to_gpu, and
hsakmt_fmm_unmap_from_gpu by using the new helper.
Signed-off-by: Honglei Huang <Honglei1.Huang@amd.com>