m7: Fix remote submix sample rate

 * Avoid mismatch between source and sink.

Change-Id: I1ec9b7a723e21ccad7bbd8d23d794d099d8afc38
m7-common: Remove HCE

Change-Id: I81151a7073db5d4fdb799c4414ae0b1d39886ec8
m7-common: switch back to ondemand

Change-Id: I0465bd8a36214a0faeab1c1088d7bf791550be82