Add qrscan to t21_lite_chinamobile-hdc-51-a5-v12 device

devices/t21_lite_chinamobile-hdc-51-a5-v12/general/overlay/etc/init.d/S97qrscan

@@ -0,0 +1,7 @@
+#!/bin/sh
+
+case "$1" in
+	start)
+		qrscan.sh >/dev/null 2>&1 &
+		;;
+esac

devices/t21_lite_chinamobile-hdc-51-a5-v12/general/overlay/usr/sbin/qrscan.sh

@@ -0,0 +1,29 @@
+#!/bin/sh
+
+gpio=53   # RED led, t21_lite_chinamobile-hdc-51-a5-v12
+n=0
+
+echo 1 > /sys/class/gpio/gpio${gpio}/active_low
+gpio set ${gpio} | logger -t gpio
+
+while true ; do
+    if [ "$n" -ge 30 ]; then
+        logger -t qrscan "Recognition timeout exceeded, reboot camera and try again..."
+        gpio clear ${gpio} | logger -t gpio
+        exit 1
+    fi
+    timeout 1 wget -q -O /tmp/image.jpg http://127.0.0.1/image.jpg
+    data=$(qrscan -p /tmp/image.jpg)
+    if [[ -n "$data" ]] && $(echo "$data" | grep -q =); then
+        fw_setenv $(echo $data | cut -d " " -f 1 | sed 's/=/ /')
+        fw_setenv $(echo $data | cut -d " " -f 2 | sed 's/=/ /')
+        fw_setenv $(echo $data | cut -d " " -f 3 | sed 's/=/ /')
+        logger -t qrscan "Recognition successfully, wlanssid and wlanpass is writed to env. Reboot required."
+        curl --data-binary @/usr/lib/sounds/ready_48k.pcm http://localhost/play_audio
+        for a in $(seq 10) ; do (gpio set ${gpio} ; sleep 0.3 ; gpio clear ${gpio} ; sleep 0.3 ) ; done >/dev/null 2>&1
+        reboot -f
+    fi
+    sleep 1
+    n=$((n + 1))
+done
+