m7-common: Disable input filtering

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

Change-Id: I6a342f1d52c78f213a517fa5e6951000e9742322
Update TARGET_KERNEL_CONFIG for slim defconfig

Change-Id: If36ea95188c8e059ee15070f77f9e2c7ade8093f
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
m7-common: Use dual mic for Speaker DMIC Stereo

Change-Id: Ia269ba5df1b8cc3476d6f17c076ca5c0cb03d8b1