Do not merge: Revert the revert of "LTE Changes for Telephony including Multiple PDN support and IPV6 support"

This reverts commit eca208fae6d1b6ae9c8c0e42eee092e86dbddbb7
and is the first of the LTE commits in master being back ported
to the LTE branch.

Change-Id: I17d4a1b779ed74bc7dfb409d2c1a30f60fdb27c7
43 files changed