USB current limit when phone off

[Andy Green]

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Somebody in the thread at some point said:

| I'll see if I can reproduce it here in a little while since it's a very
| specific thing you're seeing.

I was able to reproduce it, powering from a laptop USB port with cut D+
/ D- signals in the cable so it can't enumerate.

It's nothing to do with the rootfs.  shutdown -h now jolts us to 450mA
consumption from 100mA when the shutdown completes.

- -Andy
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