input: TWL6030 input support for power button, USB and charger

This adds support for detecting a few inputs exported by the TWL6030.
Currently-supported inputs are the power button, USB and charger

input: TWL6030 input support for power button, USB and charger

This adds support for detecting a few inputs exported by the TWL6030.
Currently-supported inputs are the power button, USB and charger presence.

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

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