usb: chipidea: imx: refine clock operations to adapt for all platforms
Some i.mx platforms need three clocks to let controller work, but others only need one, refine clock operation to adapt for all platforms, it fixes a regression found at i.mx27. Signed-off-by: Peter Chen <peter.chen@freescale.com> Tested-by: Fabio Estevam <fabio.estevam@freescale.com> Cc: <stable@vger.kernel.org> #v4.1+
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