Settings: Add FOTA updater

Squashed commit of the following:

Author: Ricardo Cerqueira <cyanogenmod@cerqueira.org>
Support the signed-builds FOTA updater, too
Change-Id: I2724881d6252ce7ce17ed9b3cfa94f6fecae1f7d

Author: Brint E. Kriebel <bekit@cyngn.com>
settings: Rename FOTA package
Change-Id: Ic1131261c275c15de308dded0aea36b61942a986

Change-Id: I2724881d6252ce7ce17ed9b3cfa94f6fecae1f7d