cm: Move default ringtone override to telephony.mk

Change-Id: If5bf8f72f9b07271145d910ba5c44dc73748ae27
(cherry picked from commit a278f039cb955f88b1a9987630a197945da2c311)
overlay: add tmo and att default LTE apns

Change-Id: Ic243e0f9a37bbb50fb8d3b4c598f7e6e7e663fce
(cherry picked from commit ff14150a5d2451a7bfdad66bfb39c2e024393f11)

Conflicts:
	CONTRIBUTORS.mkdn
overlay: remove Verizon specific eri.xml

Restore order to the universe by removing that which is evil.

For some strange reason, Verizon devices do not agree on the eri.xml to
use, even on the same spn. Since it is not universal, it does not belong
in vendor/cm (at least while there is no automatic method to check which
eri.xml should be used). Remove these so that we don't end up with
strange double-overlay issues for devices.

Change-Id: If5a28ed03c8cc6b145c151c7ebf95fabdf81f434
(cherry picked from commit 5f92da62c686c12c00fc9f7948654816c586f838)