u-boot low-battery handling

[Andy Green]

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Somebody in the thread at some point said:
| I have been experimenting with deeply-discharged batteries on my
| Freerunner. When the battery was very low (but not low enough to trigger
| the battery's internal cutoff) I was not able to boot reliably when
| plugged into the wall charger. I was more successful when using a USB
| cable connected to my PC.

Weurgh it's a scary mess in there -- not your patches the whole U-Boot
power thing.

Maybe the best way to come at this is going to be move GTA02 to Qi which
has no power handling and fix GTA02 at the same time we allegedly solve
the GTA03 booting-under-100mA thing.  At that point, the bootloader has
no part in charging action and it just waits for kernel to handle it (as
it has to anyway).

- -Andy
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