drm/radeon/ci: silence a harmless PCC warning

This has been a source of confusion. Make it debug only.

Signed-off-by: Alex Deucher <[e-mail]>
Cc: [e-mail]

drivers/gpu/drm/radeon/ci_dpm.c

···
 			tmp |= DPM_ENABLED;
 			break;
 		default:
-			DRM_ERROR("Invalid PCC GPIO: %u!\n", gpio.shift);
+			DRM_DEBUG("Invalid PCC GPIO: %u!\n", gpio.shift);
 			break;
 		}
 		WREG32_SMC(CNB_PWRMGT_CNTL, tmp);