drm/amd/display: Clean up errors in dcn315_smu.c

Fix the following errors reported by checkpatch:

ERROR: open brace '{' following struct go on the same line
ERROR: code indent should use tabs where possible
Signed-off-by: Ran Sun <sunran001@208suo.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/dc/clk_mgr/dcn315/dcn315_smu.c

@@ -33,13 +33,11 @@
 #define MAX_INSTANCE                                        6
 #define MAX_SEGMENT                                         6
 
-struct IP_BASE_INSTANCE
-{
+struct IP_BASE_INSTANCE {
     unsigned int segment[MAX_SEGMENT];
 };
 
-struct IP_BASE
-{
+struct IP_BASE {
     struct IP_BASE_INSTANCE instance[MAX_INSTANCE];
 };