drm/amdgpu/pp: remove duplicate assignment

is_dpm_running callback was assigned to the same value
twice.  Drop the duplicate.
Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/powerplay/smumgr/vegam_smumgr.c

@@ -2379,6 +2379,5 @@ const struct pp_smumgr_func vegam_smu_funcs = {
 	.update_sclk_threshold = vegam_update_sclk_threshold,
 	.is_hw_avfs_present = vegam_is_hw_avfs_present,
 	.thermal_avfs_enable = vegam_thermal_avfs_enable,
-	.is_dpm_running = vegam_is_dpm_running,
 	.thermal_setup_fan_table = vegam_thermal_setup_fan_table,
 };