wifi: Confirm user permission before toggling wifi.

Check user permissions before enabling/disabling wifi.
https://www.codeaurora.org/cgit/external/gigabyte/platform/frameworks/base/commit/?h=caf/kitkat&id=85a661086d6a7b9e208fe101b09b959d1b751b88

	modified:   core/java/android/app/AppOpsManager.java
	modified:   core/res/res/values/config.xml
	modified:   wifi/java/android/net/wifi/WifiManager.java

Change-Id: Ia7eb248b0ea6efdd3636aaa60cb6836adb576a8b