drm/amd/powerplay: mark phm_master_table_* structs as const

Also adjust phm_construct_table to take a const pointer

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Nils Wallménius <nils.wallmenius@gmail.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
diff --git a/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h b/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h
index 928f5a7..e1ca36c 100644
--- a/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h
+++ b/drivers/gpu/drm/amd/powerplay/inc/hwmgr.h
@@ -141,7 +141,7 @@
 struct phm_master_table_header {
 	uint32_t storage_size;
 	uint32_t flags;
-	struct phm_master_table_item *master_list;
+	const struct phm_master_table_item *master_list;
 };
 
 struct phm_runtime_table_header {
@@ -199,7 +199,7 @@
 			      void *input, void *output);
 
 extern int phm_construct_table(struct pp_hwmgr *hwmgr,
-			       struct phm_master_table_header *master_table,
+			       const struct phm_master_table_header *master_table,
 			       struct phm_runtime_table_header *rt_table);
 
 extern int phm_destroy_table(struct pp_hwmgr *hwmgr,