base-files: add ucidef_set_led_usbport for full usbport support

This helper allows using usbport trigger directly. It requires usbport
compatible syntax and supports specifying multiple USB ports, e.g.:
ucidef_set_led_usbport "usb" "USB" "devicename:colour:function" "usb1-port1" "usb2-port1"

This adds a proper object to the board.json, e.g.
"usb": {
	"name": "USB",
	"type": "usbport",
	"sysfs": "devicename:colour:function",
	"ports": [
		"usb1-port1",
		"usb2-port1"
	]
}
and supports translating it into uci section.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

package/base-files/files/lib/functions/uci-defaults.sh

@@ -390,6 +390,30 @@ ucidef_set_led_usbdev() {
 	json_select ..
 }
 
+ucidef_set_led_usbport() {
+	local obj="$1"
+	local name="$2"
+	local sysfs="$3"
+	shift
+	shift
+	shift
+
+	json_select_object led
+
+	json_select_object "$obj"
+	json_add_string name "$name"
+	json_add_string type usbport
+	json_add_string sysfs "$sysfs"
+	json_select_array ports
+		for port in "$@"; do
+			json_add_string port "$port"
+		done
+	json_select ..
+	json_select ..
+
+	json_select ..
+}
+
 ucidef_set_led_wlan() {
 	local cfg="led_$1"
 	local name="$2"