m7vzw: move Telephony overlay to device

These overlay settings are applicable to m7vzw only, and should be
applied to more spns than 311480. Move them out of common and into
the correct overlay structure here.

Change-Id: I34b7b944d30706db55f42a5b4eb91b51b70b5fb6
Merge branch 'cm-11.0' into stable/cm-11.0