drm/radeon/ci: silence a harmless PCC warning

This has been a source of confusion.  Make it debug only.
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org

drivers/gpu/drm/radeon/ci_dpm.c

@@ -5818,7 +5818,7 @@ int ci_dpm_init(struct radeon_device *rdev)
 			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);