device/qcom/msm8226: init.target.rc: add usb.chgdisabled property

This allows users to persistently turn on or off charging on MSM8226.

Change-Id: I22bfe7da885b9d99a98c4ff6d004f266412b398e
diff --git a/init.target.rc b/init.target.rc
index 8c0ac35..bfff5cb 100644
--- a/init.target.rc
+++ b/init.target.rc
@@ -57,6 +57,13 @@
     user camera
     group camera system inet input graphics
 
+# Allow usb charging to be disabled persistently
+on property:persist.usb.chgdisabled=1
+   write /sys/class/power_supply/battery/charging_enabled 0
+
+on property:persist.usb.chgdisabled=0
+   write /sys/class/power_supply/battery/charging_enabled 1
+
 service time_daemon /system/bin/time_daemon
    class late_start
    user root