ac power_supply changed to adapter

[Andy Green]

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Somebody in the thread at some point said:

| Is there a specific reason for this? I chose ac initially because that
| is what Android expects. I can abstract it out if adapter is thought to
| be a better choice.

Balaji can tell for sure but I think this may be confusion at one end or
the other (maybe my end :-) ).  pcf50633 supports an "adapter" path that
we don't use on GTA02, but Balaji has exposed it since it's meant to be
generic solution for that device now.

I assume what you had as "ac" was the 1A charger coming in through USB?

- -Andy
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