audio: Changes for LPA/Tunnel mode

 Intitial changes to enable LPA/Tunnel mode

Change-Id: I099480931661c1190b53363d2ee6716a78b81ccb
system/core: Add command NATIVE_WINDOW_SET_BUFFERS_SIZE

Add native window command to set user defined buffer size.

Change-Id: Id6d1f96daba81e8aba83479b5bda6ce0bfabb6e7