[2/3] services_telephony: 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

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