[U-Boot] usb_test_unit_ready called every block read - performance

[Marek Vasut]

Dear Jim Shimer,

> Hi Marek,
> 
> Here's a patch.
> 
> -Jim
[...]

I applied modified patch, please check u-boot-usb.git if you agree.

btw please read http://www.denx.de/wiki/U-Boot/Patches

Best regards,
Marek Vasut