drm/radeon/dp_auxch: Ratelimit aux transfer debug messages

Aux transfers always fail with non-zero status flags when there's
nothing connected on the port, so we don't usually need to see all of
the debugging information from it. Also, we try reprobing a -lot-, so
without ratelimiting most of the kernel log is filled up with messages
from radeon_dp_aux_transfer_native.

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

drivers/gpu/drm/radeon/radeon_dp_auxch.c

···
 		goto done;
 	}
 	if (tmp & AUX_RX_ERROR_FLAGS) {
-		DRM_DEBUG_KMS("dp_aux_ch flags not zero: %08x\n", tmp);
+		DRM_DEBUG_KMS_RATELIMITED("dp_aux_ch flags not zero: %08x\n",
+					  tmp);
 		ret = -EIO;
 		goto done;
 	}