hal: Add changes for dolby DS2
-Add device to back end mapping for APQ8084 and MSM8994.
-Set initialization info like sound card number, dmid
to ds2 dap hal.
-Add mixer control DS2 OnOff to enable or disable DS2
-A property "audio.dolby.ds2.enabled" is added to trigger
the mixer control.
-Reuse ds1 functions for checking dolby format and getting
sound codec id.
CRs-Fixed: 661095 661018
Conflicts:
hal/audio_hw.c
hal/msm8916/platform.c
Change-Id: Iff5fdc49249eb035c2ccde18e190ccc6c3ff632a
7 files changed