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