m7-common: Update SCO channel and rate

* New kernel changes INTERNAL_BT_SCO to SLIM_1

Change-Id: I1bb5fe15ee02d00cfddd968abb28a3c1c377cabe
m7: Fix remote submix sample rate

 * Avoid mismatch between source and sink.

Change-Id: I1ec9b7a723e21ccad7bbd8d23d794d099d8afc38
m7-common: Disable input filtering

* These devices don't need it, and it reduces latency

Change-Id: I6a342f1d52c78f213a517fa5e6951000e9742322
m7-common: Switch to DMIC Endfire for Speaker DMIC Endfire

* This is supposed to use DMIC4 on stock, but that appears to be
  horrible. Use DMIC Endfire setup instead.

Change-Id: Id4e583f58cee6bd8fcb1e1815f5c6b1e3664809f