Use a meaningful name for the reference clocks so that it indicates the
function.

Update the OMAP4+ USB Host node as well to be in sync with the changes.
Acked-by: NTony Lindgren <tony@atomide.com>
Signed-off-by: NRoger Quadros <rogerq@ti.com>
Signed-off-by: NLee Jones <lee.jones@linaro.org>