drm/amd/powerplay: helper interfaces for MGPU fan boost feature

MGPU fan boost feature is enabled only when two or more dGPUs
in the system.

Signed-off-by: Evan Quan <evan.quan@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/include/kgd_pp_interface.h

@@ -272,6 +272,7 @@ struct amd_pm_funcs {
 	int (*get_display_mode_validation_clocks)(void *handle,
 		struct amd_pp_simple_clock_info *clocks);
 	int (*notify_smu_enable_pwe)(void *handle);
+	int (*enable_mgpu_fan_boost)(void *handle);
 };
 
 #endif