drm/amdgpu: removed GFX RAS support check in UMC ECC callback

enable GPU recovery in event of uncorrectable UMC error

Signed-off-by: John Clements <john.clements@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>