bcm27xx: bcm2708: add missing RPi B DTS file

RPI 1B DTS has been splitted into 2 files:
 - bcm2708-rpi-b.dts: Newest (rev2) RPI 1B
 - bcm2708-rpi-b-rev1.dts: Old (rev1) RPI 1B

Signed-off-by: Álvaro Fernández Rojas <[email protected]>

target/linux/bcm27xx/image/Makefile

@@ -66,7 +66,7 @@ endef
 define Device/rpi
   DEVICE_MODEL := B/B+/CM/Zero/ZeroW
   DEVICE_DTS := \
-	bcm2708-rpi-b bcm2708-rpi-b-plus \
+	bcm2708-rpi-b bcm2708-rpi-b-rev1 bcm2708-rpi-b-plus \
 	bcm2708-rpi-cm \
 	bcm2708-rpi-zero bcm2708-rpi-zero-w
   SUPPORTED_DEVICES := \