usb: usb3503: add PM functions
The usb3503 needs to switch to standby mode while suspending and should switch to hub mode when resumed. Also we can control clock on PM function. Signed-off-by: NJoonyoung Shim <jy0922.shim@samsung.com> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
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