configs: Add built-in/Back mic to primary input sources

Built-in mic and Built-In Back Mic aren't in supported devices
list of primary input, so record_24 is selected if without
connecting any headset, if there is more than 2 capture
concurrency, it will fail to open input for primary input when
connecting headseti in AHAL.

Add built-in mic to primary input sources to reuse input to avoid
to open extra input stream in AHAL.

CRs-fixed: 2643298
Change-Id: Iece1fa56a179585e8c282375951cd5fc16292a47
1 file changed