Generic multi-carrier overlays based on hammerhead

 -Added Sprint MWI quirk to 310120
 -Added Verizion specific eri file

Change-Id: Icfd6f168fe7bed2a906267cd052335abd0867663
Multi-carrier overlays: Fix Mms

 -Set default uaProfUrl which can then be overridden
 -Add verizon eri for 31099

Change-Id: I24c9ab498cf4058367987cfe12513c4adddb7543
multi-carrier overlays: Add eri and config for US Cellular

Change-Id: I112716f94eb9fe7509845689688fcea13da361f7
add more vzw eri's

Change-Id: I8a299ad5d727dd084eb173aeb040c165bb556f51
overlay: fix verizon roaming indicator

Change-Id: I09308fc25496d759608628046fbc21722a7fcb72