usb: mxs-phy: re-init phy during the connection is useless

As phy is working, re-init phy may cause unexpected results

Signed-off-by: Peter Chen <peter.chen@freescale.com>
Acked-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>