USB current limit when phone off

[Andy Green]

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Somebody in the thread at some point said:

| We can work around it by setting the charger unit charge limit (MBCC5)
| at the same time and to the same amount as the authorized USB limit in
| pcf50633_mbc_usb_curlim_set().
|
| This will fix it because although then the USB input is allowed to pull
| an illegal 500mA, the rest of the board stuff at VB_SYS is OFF, so if we
| limited the charger to 100mA before, 100mA is all it will eat even when
| off and allowed to eat 500mA.

Yes it seems to work OK, with this change: I updated the kernel in
http://people.openmoko.org/andy if it helps test it.

- -Andy
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