brcm2708: add support for the new Raspberry Pi Zero W

Support is experimental since I haven't got any device to test.

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

target/linux/brcm2708/Makefile

@@ -1,5 +1,6 @@
 #
 # Copyright (C) 2012-2016 OpenWrt.org
+# Copyright (C) 2017 LEDE project
 #
 # This is free software, licensed under the GNU General Public License v2.
 # See /LICENSE for more information.
@@ -21,7 +22,12 @@ define Target/Description
 endef
 
 include $(INCLUDE_DIR)/target.mk
-DEFAULT_PACKAGES += brcm2708-gpu-fw kmod-usb-hid kmod-sound-core kmod-sound-arm-bcm2835 kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1
+DEFAULT_PACKAGES += \
+	brcm2708-gpu-fw \
+	kmod-usb-hid \
+	kmod-sound-core kmod-sound-arm-bcm2835 \
+	kmod-fs-vfat kmod-nls-cp437 kmod-nls-iso8859-1 \
+	brcmfmac-firmware-43430-sdio kmod-brcmfmac wpad-mini
 
 KERNELNAME:=Image dtbs
 

target/linux/brcm2708/image/Makefile

@@ -55,8 +55,8 @@ define Device/Default
 endef
 
 define Device/rpi
-  DEVICE_TITLE := Raspberry Pi B/B+/CM/Zero
-  DEVICE_DTS := bcm2708-rpi-b bcm2708-rpi-b-plus bcm2708-rpi-cm
+  DEVICE_TITLE := Raspberry Pi B/B+/CM/Zero/ZeroW
+  DEVICE_DTS := bcm2708-rpi-b bcm2708-rpi-b-plus bcm2708-rpi-cm bcm2708-rpi-0-w
 endef
 ifeq ($(SUBTARGET),bcm2708)
   TARGET_DEVICES += rpi
@@ -65,7 +65,6 @@ endif
 define Device/rpi-2
   DEVICE_TITLE := Raspberry Pi 2B/3B/3CM
   DEVICE_DTS := bcm2709-rpi-2-b bcm2710-rpi-3-b bcm2710-rpi-cm3
-  DEVICE_PACKAGES := brcmfmac-firmware-43430-sdio kmod-brcmfmac wpad-mini
 endef
 ifeq ($(SUBTARGET),bcm2709)
   TARGET_DEVICES += rpi-2
@@ -75,7 +74,6 @@ define Device/rpi-3
   KERNEL_IMG := kernel8.img
   DEVICE_TITLE := Raspberry Pi 3B (64 bit)
   DEVICE_DTS := broadcom/bcm2710-rpi-3-b
-  DEVICE_PACKAGES := brcmfmac-firmware-43430-sdio kmod-brcmfmac wpad-mini
 endef
 ifeq ($(SUBTARGET),bcm2710)
   TARGET_DEVICES += rpi-3