drivers:usb:fsl: Fix compilation error for fsl ehci drv

Fix compilation error in fsl ehci drv because ehci_reset()
and ehci_adjust_port_wakeup_flags() were not exported, and
are used when PM is enabled

Signed-off-by: Ramneek Mehresh <ramneek.mehresh@freescale.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>