drm/amdgpu: enable gfxoff for gc v12.0.0

Enable GFXOFF for GC v12.0.0.
Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/gfx_v12_0.c

@@ -3608,6 +3608,7 @@ static int gfx_v12_0_set_powergating_state(void *handle,
 		return 0;
 
 	switch (amdgpu_ip_version(adev, GC_HWIP, 0)) {
+	case IP_VERSION(12, 0, 0):
 	case IP_VERSION(12, 0, 1):
 		amdgpu_gfx_off_ctrl(adev, enable);
 		break;