greybus: gpbridge: Rename gb-phy.ko module

Rename gb-phy.ko module as gb-gpbridge.ko.

Tested on EVT 1.5 by inserting GP test module, all the devices were
enumerated correctly.
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/Makefile

@@ -14,7 +14,7 @@ greybus-y :=	core.o		\
 		operation.o	\
 		legacy.o
 
-gb-phy-y :=	gpbridge.o
+gb-gpbridge-y := gpbridge.o
 
 # Prefix all modules with gb-
 gb-vibrator-y := vibrator.o
@@ -42,7 +42,7 @@ gb-i2c-y := i2c.o
 gb-usb-y := usb.o
 
 obj-m += greybus.o
-obj-m += gb-phy.o
+obj-m += gb-gpbridge.o
 obj-m += gb-vibrator.o
 obj-m += gb-power-supply.o
 obj-m += gb-loopback.o