oxnas: switch to generic board detect

remove /lib/oxnas.sh platform-specific board-detection and use
generic which is based on device-tree compatible node instead.

Signed-off-by: Daniel Golle <daniel@makrotopia.org>

target/linux/oxnas/base-files/etc/board.d/02_network

@@ -2,14 +2,37 @@
 
 . /lib/functions/uci-defaults.sh
 . /lib/functions/system.sh
-. /lib/oxnas.sh
 
 board_config_update
 
 lan_mac=""
 
+bootloader_cmdline_var() {
+	local param
+	local pval
+	for arg in $(cat /proc/device-tree/chosen/bootloader-args); do
+		param="$(echo $arg | cut -d'=' -f 1)"
+		pval="$(echo $arg | cut -d'=' -f 2-)"
+
+		if [ "$param" = "$1" ]; then
+			echo "$pval"
+		fi
+	done
+}
+
+legacy_boot_mac_adr() {
+	local macstr
+	local oIFS
+	macstr="$(bootloader_cmdline_var mac_adr)"
+	oIFS="$IFS"
+	IFS=","
+	set -- $macstr
+	printf "%02x:%02x:%02x:%02x:%02x:%02x" $1 $2 $3 $4 $5 $6
+	IFS="$oIFS"
+}
+
 case "$(board_name)" in
-	kd20)
+	"shuttle,kd20")
 		lan_mac="$(legacy_boot_mac_adr)"
 		;;
 esac