greybus: apba: add fct flow usb control requests

Add control requests to enable/disable the flow of unipro FCT tokens
Reviewed-by: Johan Hovold <johan@hovoldconsulting.com>
Signed-off-by: Fabien Parent <fparent@baylibre.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus_protocols.h

@@ -195,6 +195,9 @@ struct gb_control_interface_version_response {
 /* request to control the CSI transmitter */
 #define GB_APB_REQUEST_AUDIO_CONTROL	0x09
 
+/* vendor requests to enable/disable FCT tokens flow */
+#define GB_APB_REQUEST_FCT_FLOW_EN	0x0b
+#define GB_APB_REQUEST_FCT_FLOW_DIS	0x0c
 
 /* Firmware Protocol */