ipq806x: convert to dt-based board-detection

Use the generic board detection method:
- Board name: First compatible string from the device tree
- Board model: Model property from the device tree

Change occurrences of board name in userspace by the compatible
string, and removed target specific board detection script

Replace the definition of SUPPORTED_DEVICES in Device/Default
to extract the dt compatible string from each device definition.
Additionally, for devices supported by lede-17.01, append
the value of BOARD_NAME to SUPPORTED_DEVICES in the device
definition.

Signed-off-by: Luis Araneda <luaraneda@gmail.com>

target/linux/ipq806x/base-files/lib/upgrade/platform.sh

@@ -10,24 +10,24 @@ platform_check_image() {
 
 platform_do_upgrade() {
 	case "$(board_name)" in
-	ap148 |\
-	ap-dk04.1-c1 |\
-	d7800 |\
-	nbg6817 |\
-	r7500 |\
-	r7500v2 |\
-	r7800)
+	netgear,d7800 |\
+	netgear,r7500 |\
+	netgear,r7500v2 |\
+	netgear,r7800 |\
+	qcom,ap-dk04.1-c1 |\
+	qcom,ipq8064-ap148 |\
+	zyxel,nbg6817)
 		nand_do_upgrade "$ARGV"
 		;;
-	c2600)
+	tplink,c2600)
 		PART_NAME="os-image:rootfs"
 		MTD_CONFIG_ARGS="-s 0x200000"
 		default_do_upgrade "$ARGV"
 		;;
-	ea8500)
+	linksys,ea8500)
 		platform_do_upgrade_linksys "$ARGV"
 		;;
-	vr2600v)
+	tplink,vr2600v)
 		PART_NAME="kernel:rootfs"
 		MTD_CONFIG_ARGS="-s 0x200000"
 		default_do_upgrade "$ARGV"
@@ -40,7 +40,7 @@ platform_do_upgrade() {
 
 platform_nand_pre_upgrade() {
 	case "$(board_name)" in
-	nbg6817)
+	zyxel,nbg6817)
 		zyxel_do_upgrade "$1"
 		;;
 	esac

target/linux/ipq806x/base-files/lib/upgrade/zyxel.sh

@@ -74,7 +74,7 @@ zyxel_do_upgrade() {
 
 	[ -b "${rootfs}" ] || return 1
 	case "$board" in
-	nbg6817)
+	zyxel,nbg6817)
 		case "$rootfs" in
 			"/dev/mmcblk0p5")
 				kernel=mmcblk0p4