QS/PW: Check for mobile data instead of telephony permissions (1/2)

For QuickSettings and Power Widget check if there is
ConnectivityManager.TYPE_MOBILE network avaialbe directly instead of relying
on a checking for the PackageManager.FEATURE_TELEPHONY permission.  Some
devices like tilapia (Nexus 7 GSM) has mobile data but does not set the
telephony permission.

Patchset 2:
   	- Use ConnectivityManager.isNetworkSupported() instead of checking for a null
	  value returned from ConnectivityManager.getNetworkInfo(). Thanks
	- Have MobileNetworkTile use the QSUtil deviceSupportsMobileData method

Change-Id: I71bd6217cbe08622f805de4ae30a87df11340f5f
Fixes: CYAN-803

Conflicts:
	packages/SystemUI/src/com/android/systemui/statusbar/phone/QuickSettingsController.java