Uboot ehci improvements

Jason, Joel,

Could you please have a look at https://github.com/koenkooi/u-boot/pull/1 ?

regards,

Koen

All look good to me.

I don't think adding the delays during bulk transfers is a correct
solution for the EHCI timeouts, as I remember that this didn't solve
the problem. But [1] seemed fix it so that could be included in your
tree. I will be working on submitting it to U-boot mainline as well.

Thanks,
Joel

[1] https://github.com/joelagnel/u-boot/commit/aded96562ec8167e1f8a075db8c88af96c835e96