libril: update to match ruby

Change-Id: I826217b6ae9ee11a866ca0174a426fbfffd86713
system.prop: fix up signal strength

Change-Id: I538823d655912c0007fd50f9c412ce11afab2e37
system.prop: remove old or unused settings

Change-Id: I30845ce3ad7c0bdf65d1683a8c08d44670ca8937
system.prop: general update

Change-Id: I19f72eae447e72396b051b80fdcd4da9dc8b9eb8