ARM: dts: omap3-igep0020: Add HS USB Host support

Add device nodes for the HS USB Host port 1, USB PHY and its
required regulator and also pin mux setup for HS USB1 pins.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Tested-by: Enric Balletbo i Serra <eballetbo@gmail.com>
Acked-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Benoit Cousson <bcousson@baylibre.com>