AT91 USB driver fix

[Andrew Lunn]

Hi Folks

The AT91 USB driver can use a GPIO line to control the pullup used to
indicate to the host that the device is ready to start work. This GPIO
line can either be active high or active low. There was CDL to control
this. However the CDL was broken. The C code was similarly broken so
that it worked on the AT91SAM7S-EK development board where the code
was developed. I've now been using the code on a custom board where i
needed to use the invert and the bugs came to light. This patch fixes
the problems.

    Andrew
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