greybus: greybus_protocols: fix apba vendor-request comment

Fix copy-paste error in an APBA USB vendor-request comment.
Signed-off-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus_protocols.h

@@ -243,7 +243,7 @@ struct gb_control_intf_pm_response {
 /* request to control the CSI transmitter */
 #define GB_APB_REQUEST_CSI_TX_CONTROL		0x08
 
-/* request to control the CSI transmitter */
+/* request to control audio streaming */
 #define GB_APB_REQUEST_AUDIO_CONTROL		0x09
 
 /* vendor requests to enable/disable CPort features */