amd/powerplay: use kmemdup instead of kmalloc + memcpy

Save a few clocks by replacing calls to kmalloc followed by memcpy
with a single call to kmemdup.

Reviewed-by: Christian König <[e-mail]>
Signed-off-by: Edward O'Callaghan <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/powerplay/amd_powerplay.c

···
 	PP_CHECK_HW(hwmgr);
 
 	if (!hwmgr->hardcode_pp_table) {
-		hwmgr->hardcode_pp_table =
-				kzalloc(hwmgr->soft_pp_table_size, GFP_KERNEL);
+		hwmgr->hardcode_pp_table = kmemdup(hwmgr->soft_pp_table,
+						   hwmgr->soft_pp_table_size,
+						   GFP_KERNEL);
 
 		if (!hwmgr->hardcode_pp_table)
 			return -ENOMEM;
-
-		/* to avoid powerplay crash when hardcode pptable is empty */
-		memcpy(hwmgr->hardcode_pp_table, hwmgr->soft_pp_table,
-				hwmgr->soft_pp_table_size);
 	}
 
 	memcpy(hwmgr->hardcode_pp_table, buf, size);