drm/amdgpu/soc21: add initial GC 11.5.0 soc21 support

Disable clock gating and power gating on the early bring up phase.
Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/soc21.c

@@ -688,6 +688,12 @@ static int soc21_common_early_init(void *handle)
 		adev->external_rev_id = adev->rev_id + 0x80;
 		break;
 
+
+	case IP_VERSION(11, 5, 0):
+		adev->cg_flags = 0;
+		adev->pg_flags = 0;
+		adev->external_rev_id = adev->rev_id + 0x1;
+		break;
 	default:
 		/* FIXME: not supported yet */
 		return -EINVAL;