drm/radeon: enable vce dpm on CI

VCE dpm dynamically adjusts the uvd clocks on
demand.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/ci_dpm.c

@@ -5153,6 +5153,7 @@ int ci_dpm_init(struct radeon_device *rdev)
 	pi->caps_sclk_throttle_low_notification = false;
 
 	pi->caps_uvd_dpm = true;
+	pi->caps_vce_dpm = true;
 
         ci_get_leakage_voltages(rdev);
         ci_patch_dependency_tables_with_leakage(rdev);