m7-common: use distinct VOIP devices

Change-Id: Ia2db0d41a669129982377eeb4a3f94e3cf530137
m7-common: Fix speaker device

Speaker device is actually activated by the MI2S mixer, not a control
or switch like the other devices. Add additional Speaker and VOIP
Speaker modifiers and verbs.

Change-Id: I85d4286ad47e1468db9823d8c1c19730a5161b76
m7-common: remove unused VM devices

Change-Id: Id059021c8dfa6f6a4a7cc11ee360e16f6b666536
m7-common: add voice recognition headset device

Change-Id: I63b876f47f79485da02b63a68073ac44ff10c168