Revert "m7-common: Use dual mic for Speaker DMIC Stereo"

This reverts commit ee7794c648d39ac2de4e8e214569bea7dd734fb7.
Revert "m7-common: Switch to DMIC Endfire for Speaker DMIC Endfire"

This reverts commit dba1d7931aafadf8281abbc1d748d58608b726ff.