init: enable auto-loki for att and vzw variants

Change-Id: I8a42d5dbb38e5af3aa9e905342b66b0a20990e8f
jflte: increase read-ahead cache size

Change-Id: If6fbc66c406d8d0f9cf16b9907f0dfe2487a9c78
jf: Remove modem links scripts

 * Create the symlinks ourselves at build time. Remounting the system
   partition to do this is just stupid.

Change-Id: I224c20af820554661fe027e5835b18cb5589c694