drm/amd/powerplay:clean up phm_enable_clock_power_gatings

As the PG was setted by each IP block durinng IP early init thus
remove the unused phm_enable_clock_power_gatings related funcs.
Signed-off-by: Prike Liang <Prike.Liang@amd.com>
Reviewed-by: Kenneth Feng <kenneth.feng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/hwmgr/hardwaremanager.c

@@ -154,15 +154,6 @@ int phm_powerdown_uvd(struct pp_hwmgr *hwmgr)
 	return 0;
 }
 
-int phm_enable_clock_power_gatings(struct pp_hwmgr *hwmgr)
-{
-	PHM_FUNC_CHECK(hwmgr);
-
-	if (NULL != hwmgr->hwmgr_func->enable_clock_power_gating)
-		return hwmgr->hwmgr_func->enable_clock_power_gating(hwmgr);
-
-	return 0;
-}
 
 int phm_disable_clock_power_gatings(struct pp_hwmgr *hwmgr)
 {

drivers/gpu/drm/amd/powerplay/inc/hardwaremanager.h

@@ -397,7 +397,6 @@ struct phm_odn_clock_levels {
 };
 
 extern int phm_disable_clock_power_gatings(struct pp_hwmgr *hwmgr);
-extern int phm_enable_clock_power_gatings(struct pp_hwmgr *hwmgr);
 extern int phm_powerdown_uvd(struct pp_hwmgr *hwmgr);
 extern int phm_setup_asic(struct pp_hwmgr *hwmgr);
 extern int phm_enable_dynamic_state_management(struct pp_hwmgr *hwmgr);

drivers/gpu/drm/amd/powerplay/inc/hwmgr.h

@@ -251,7 +251,6 @@ struct pp_hwmgr_func {
 	uint32_t (*get_sclk)(struct pp_hwmgr *hwmgr, bool low);
 	int (*power_state_set)(struct pp_hwmgr *hwmgr,
 						const void *state);
-	int (*enable_clock_power_gating)(struct pp_hwmgr *hwmgr);
 	int (*notify_smc_display_config_after_ps_adjustment)(struct pp_hwmgr *hwmgr);
 	int (*pre_display_config_changed)(struct pp_hwmgr *hwmgr);
 	int (*display_config_changed)(struct pp_hwmgr *hwmgr);