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

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:
	- Have power widget use the same logic as quicksettings to check for
	  mobile data

Change-Id: Ibe8059aaa5f3bd1e72e958608a34e89abfd0ad4a
Fixes: CYAN-803

Conflicts:
	src/com/android/settings/cyanogenmod/PowerWidget.java
	src/com/android/settings/cyanogenmod/QuickSettings.java