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 headset 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: I1e062520f7fb03ae97c88341dd58f77177dbe030