Add Mobile network setting
[2/3] Forward port National Data Roaming

Credits: CyanogenMod

Linked commits:
        frameworks/base: https://gerrit.paranoidandroid.co/#/c/3654/
        opt/Telephony: https://gerrit.paranoidandroid.co/#/c/3655/

Change-Id: I12a80d15d0c42434931c78ec87a9996975b53af0

Conflicts:
	res/values/simpleaosp_strings.xml
	src/com/android/phone/MobileNetworkSettings.java