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

Change-Id: I112716f94eb9fe7509845689688fcea13da361f7
Merge "multi-carrier overlays: Add eri and config for US Cellular" into cm-11.0
Merge branch 'cm-11.0' of git://github.com/CyanogenMod/android_vendor_cm into cd-4.4