add xg521 gk7202v300+gc1054 with LTE modem (#15)

devices/gk7202v300_lite_xg521/general/overlay/etc/wireless/modem

@@ -0,0 +1,17 @@
+#!/bin/sh
+
+set_gpio() {
+	[ "$2" -eq 1 ] && gpio set $1 || gpio clear $1
+	sleep 1
+}
+
+# GK7202V300 XG521 with EC800E and usb0
+if [ "$1" = "ec800e-gk7202v300-xg521" ]; then
+        set_gpio 9 0
+        modprobe usbserial vendor=0x2c7c product=0x0903
+        modprobe rndis_host
+        sleep 10
+        exit 0
+fi
+
+exit 1

devices/gk7202v300_lite_xg521/general/overlay/usr/share/openipc/customizer.sh

@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# Perform basic settings on a known IP camera
+#
+#
+# Set custom upgrade url
+#
+fw_setenv upgrade 'https://github.com/OpenIPC/builder/releases/download/latest/gk7202v300_lite_xg521-nor.tgz'
+#
+# Set custom majestic settings
+#
+cli -s .nightMode.enabled true
+cli -s .nightMode.irCutPin1 15
+cli -s .nightMode.irCutPin2 14
+cli -s .nightMode.colorToGray false
+cli -s .nightMode.backlightPin 54
+cli -s .video0.codec h264
+cli -s .audio.speakerPin 4
+#
+# Set wlan device and credentials if need
+#
+fw_setenv wlandev ec800e-gk7202v300-xg521
+
+exit 0