usb: chipidea: usbmisc_imx: Read MX53_USB_OTG_PHY_CTRL_1_OFFSET directly

There is no need to do an intermediate step for reading the
MX53_USB_OTG_PHY_CTRL_1_OFFSET register.

Read it directly instead.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Peter Chen <peter.chen@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>