* PREV/NEXT now swapped so they do what is expected in most contexts
* List and setting context retains prior behavior
* Enable the ADC that reads the headset remote and map the keys.
* As ADC-based remote "events" arrive as press/release pairs,
delay the button release.
Change-Id: I22d4eac3bfe1573b50eca795cf377bdafdeb5336
Basically no longer treat SCROLL_FWD/BACK as "button" events, instead
relying on the scrollwheel hooks to handle things properly.
Change-Id: I9bf18595ab3ca68e912f6dfb1f2eac2544578e73
