tegra20: add USB ULPI init code
This adds the required code to set up a ULPI USB port. It is mostly a port of the Linux ULPI setup code with some tweaks added for more correctness, discovered along the way of debugging this. To use this both CONFIG_USB_ULPI and CONFIG_USB_ULPI_VIEWPORT have to be set in the board configuration file. Signed-off-by: NLucas Stach <dev@lynxeye.de> Acked-by: NIgor Grinberg <grinberg@compulab.co.il>
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