drm/amdgpu: add support of tmz for GC 10.3.7

Add support of IP GC 10.3.7 in amdgpu_gmc_tmz_set.

Signed-off-by: Sunil Khatri <sunil.khatri@amd.com>
Reviewed-by: Alexander Deucher <Alexander.Deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>