d2lte: setup firmware symlinks

Change-Id: I8460026f51b1e0b82396f53f84cb61c7cce1f45b
comanche: Don't substitute naming for firmware
Update system.prop for RIL and audio tweaks
Update device.mk with configs
Include stock AT&T build number fingerprint
Bootloader doesn't seem to care about the ROMs, no need for board-info yet