greybus: gpb: Create a "GP Bridge" kernel module

This bundles together the existing GP Bridged PHY protocols that were
part of the Greybus core: USB, UART, SDIO, PWM, and GPIO.  This is now a
stand-alone kernel module.  More logic will be moving here in the future
to handle bridged devices.

Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
Reviewed-by: Alex Elder <elder@linaro.org>
diff --git a/drivers/staging/greybus/Makefile b/drivers/staging/greybus/Makefile
index 79cb193..5d73aed 100644
--- a/drivers/staging/greybus/Makefile
+++ b/drivers/staging/greybus/Makefile
@@ -7,14 +7,17 @@
 		bundle.o	\
 		connection.o	\
 		protocol.o	\
-		operation.o	\
-		gpio-gb.o	\
-		pwm-gb.o	\
+		operation.o
+
+gpbridge-y :=	gpb.o		\
 		sdio-gb.o	\
 		uart-gb.o	\
+		pwm-gb.o	\
+		gpio-gb.o	\
 		usb-gb.o
 
 obj-m += greybus.o
+obj-m += gpbridge.o
 obj-m += i2c-gb.o
 obj-m += vibrator-gb.o
 obj-m += battery-gb.o