m7-common: clean up overlay

* No real changes, just re-orders overlay items according to their
  ordering in frameworks/base.
* Satisfies my OCD.

Change-Id: Ie83ec98402bfe03e0ae3e2ad87fb65b20f41d581
overlay: use overlays based on mcc and mnc.

Added support for (cdma) sprint and vzw.

enable config_enabled_lte for sprint.
enable config_apn_expand for sprint.
enable config_show_cdma for sprint.

Change-Id: I28c114e58a133d8aeee52ecb86e61d56d3999f06
m7-common: move Phone overlays to Telephony

Change-Id: I444db57cd40f18229c5c2d6733d1fe6b08bbbc26