msm: audio-7627a-devices: Separate file for audio devices.

Both qrd7627a and msm7x27a have common audio device code which is taken
out in audio-7627a-devices.c for easy updation and addition.

Change-Id: I95ee2edb6de374319b39d339e6aab7b560519e09
Signed-off-by: Utsab Bose <ubose@codeaurora.org>