USB: ehci-omap: Fix detection in HSIC mode

The HSIC devices need to be kept in reset while the EHCI controller
is being initialized and only brought out of reset after the
initialization is complete, else HSIC devices will not be detected.

Also remove outdated TODO list from header.

Signed-off-by: Roger Quadros <rogerq@ti.com>
CC: Alan Stern <stern@rowland.harvard.edu>