drm/amdgpu: rename GEM_OP_SET_INITIAL_DOMAIN -> GEM_OP_SET_PLACEMENT

Signed-off-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -638,7 +638,7 @@ int amdgpu_gem_op_ioctl(struct drm_device *dev, void *data,
 			r = -EFAULT;
 		break;
 	}
-	case AMDGPU_GEM_OP_SET_INITIAL_DOMAIN:
+	case AMDGPU_GEM_OP_SET_PLACEMENT:
 		if (amdgpu_ttm_tt_has_userptr(robj->tbo.ttm)) {
 			r = -EPERM;
 			break;