[PATCH] Initial USB support on OMAP2

Initial full speed USB support on OMAP2 platform.
Remaining issues include:

    -   only usb0 port tested (not usb1, usb2)
    -   only peripheral/gadget controller tested (not ohci, otg)
    -   UDC DMA is not working
    -   clocks are not turned off

Board support is in separate patches.

Also minor omap_udc updates:  whitespace fixes, syncing with a few
changes from upstream, warning removal.

Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>