Revert "Revert "Use 8khz while the camera audio bug exists""

With audio-caf, the input_source is not being set in ALSAStreamOps

This reverts commit 180a2358f318d8317165e0908be87ae9161b56e4.

Change-Id: I06b2f6422e77ebac30ab3cea755daa0c7f37b529
Allow GPRS as EDGE override directly in MotorolaQualcommRIL

Change-Id: Ia3653ea79531931f6a8ca130eb2121b9725576b5
MotorolaQualcommRIL: optimize responseDataRegistrationState condition

Change-Id: I5378b322100a1ef183a55b3a2b77c7ace22cde6f
fstab: add discard and writeback

to avoid the low storage issues where the device may get very slow.
Its safe to mount with writeback and it should give a little IO performance.

Change-Id: I216593da6798df24702fba82f3abdccec24594be