libaudio: complete overhaul for mr2

Change-Id: I5fbec0a6b052512d2c74c6a195aefd78f2c0267b
msm7x27a-common: Add get_supported_devices

Change-Id: Ib7f12b8996e2c6af1a343fbe065fba927598c2f0
msm7x27a-common: drop libbt-vendor

Change-Id: I38e2d1a097e913c70b52f0ad58b8b2a279685fab
msm7x27a-common: sync headers with kernel

Change-Id: I0ae34b3ad805e4172d9f2b6df977a8620d54f71b
mm7x27a-common: switch to caf DISPLAY_VARIANT

Change-Id: If47e5e60a8b62d4e7037c3a945ab2324355f7b8c
msm7x27a-coomon: no need to create /mnt

Change-Id: Ib2de9af49d3ac1640c5ca62e70dd9efd22774e8b