[U-Boot] v3 OMAP USB

[Tom Rix]

The is version 3 of the patchset to enable usb device support on OMAP.

The changes from the last revision are.

Per Remy's request 

> > USB_CONFIG_DESCRIPTOR_DEFINITION
> > USB_INTERFACE_DESCRIPTOR_DEFINITION

> Personally I do not like the macros for these kind of definitions, I
> would prefer a solution by nesting the structures.
> What do you think?

I have exchanged the first patch to an earlier version that used
a nested structure 'desc' instead of the macros.

At the other end of the patch set I have added Ajay's changes to
condition initialization of twl4030 and enabling in omap3_evm.

I have runtested this on Beagle.

Tom