alsa_sound: Support ES325 2Mic and Samsung CSD client

 * The dual mic feature on the Audience ES325 needs to be enabled via
   csd-client on the Galaxy S4. Add support for this.
 * Samsung is using a non-standard name for the functions in csd-client.
   Add support for this.

Change-Id: I764ead9ea17729055da701a423edec97d96b8319
alsa_sound: add HTC CSD CLIENT board flag for special cases (BT)

New HTC phones like m7 have special settings for BTSco CSD device
ids. Adding board flag BOARD_HAVE_HTC_CSDCLIENT to handle
these special cases related to HTC's csd client.

Change-Id: Iae3cb4568c0d1d6b5d75cef7a836d78ab3fa9522