[PATCH] u-boot: Fix DFU upload in u-boot

[Andy Green]

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Somebody in the thread at some point said:
| Fix DFU upload in u-boot
|
| The existing USB DFU upload (read firmware from device to USB host) code
| was a big mess and probably only ever worked by accident.

Three longstanding U-Boot issues zapped, great; I added them to our
stable U-Boot branch but obviously U-Boot folks themselves will want them.

- -Andy
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