DataUsageSummary: fix mobile data usage display for GSM devices with no number

Some providers don't write phone number onto SIM card causing the
phone number check introduced in the partially reverted commit to fail.
Re-introduce the original check with the "or" condition.

This partially reverts commit 4c51b45355b9d6fed973f946738bf455a8b7c9ea.

Change-Id: I69a65a1a421dcdf168c3d0afeb7110cb97790034
Fix: Don't display the lock clock preference if its not installed

Removed duplicated codes

Change-Id: Ib7d54dfc33c6a66711799bbdf44212d287221ae9
Merge "DataUsageSummary: fix mobile data usage display for GSM devices with no number" into cm-10.1
Merge "Fix: Don't display the lock clock preference if its not installed" into cm-10.1
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
Merge "QS/PW: Check for mobile data instead of telephony permissions (2/2)" into cm-10.1
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_packages_apps_Settings into cm-10.1-n7

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