m7-common: enable mms content disposition field

Change-Id: Ie885e510e0aa05c29a2419a1706988fc5ff6f55e
m7-common: re-organize and clean-up snd_soc_msm

Remove duplicate sections: ANC Headset
Remove device-specific verbs/modifiers which duplicate the base verb/modifier
Remove unused devices: HAC Handset, SecondMic
Alphabetize within verbs, devices, and modifiers.

Change-Id: I34b21aae87a467ecc131c5c8f7da80a17acbfddd