[PATCH] add ac charger power_supply

[Andy Green]

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Somebody in the thread at some point said:

| This adds an appropriate ac power_supply class and shows usb only when
| at the appropriate current limit.

What do you think Balaji?  At first it seemed to me that adding another
power_supply is broken for generic pcf50633 case, but actually, if it is
cleared for 1A on USB for example then there is definitely an AC adapter
involved.  Is this OK for you?

- -Andy
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