greybus: audio: Fix incorrect direction value when enabling RX

The direction value passed to gb_audio_apbridgea_register_cport()
in the gbaudio_module_enable_rx() routine is TX and not RX like
it should be so fix it.

Testing Done: Recorded microphone data from a headset.

Signed-off-by: Mark Greer <mgreer@animalcreek.com>
Fixes: c80e7c6fafa5 ("audio: Split helper APIs based on stream direction")
Tested-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Reviewd-by: Vaibhav Agarwal <vaibhav.agarwal@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/audio_codec.c

@@ -207,7 +207,7 @@ static int gbaudio_module_enable_rx(struct gbaudio_codec_info *codec,
 		cportid = data->connection->hd_cport_id;
 		ret = gb_audio_apbridgea_register_cport(data->connection,
 						i2s_port, cportid,
-						AUDIO_APBRIDGEA_DIRECTION_TX);
+						AUDIO_APBRIDGEA_DIRECTION_RX);
 		if (ret) {
 			dev_err_ratelimited(module->dev,
 					    "reg_cport failed:%d\n", ret);