omap: zoom3: enable ehci support

Zoom3 board has omap3630 EHCI port2 connected to a ULPI phy.
GPIO_64 is connected to the PHY reset pin.

Signed-off-by: Vikram Pandita <vikram.pandita@ti.com>
Cc: Anand Gadiyar <gadiyar@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>