phy: omap-usb2: Add clock names to Documentation binding
Add "wkupclk" and "refclk" information to DT binding information. Reviewed-by: NFelipe Balbi <balbi@ti.com> Signed-off-by: NRoger Quadros <rogerq@ti.com> Signed-off-by: NKishon Vijay Abraham I <kishon@ti.com>
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