usb: chipidea: imx: Add a missing blank line

Fix a checkpatch warning:
CHECK: Please use a blank line after function/struct/union/enum declarations

Reported-by: Xu Yang <xu.yang_2@nxp.com>
Acked-by: Peter Chen <peter.chen@kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Link: https://lore.kernel.org/r/36d1c961-319e-4457-bdc1-69f8b6bed33e@sabinyo.mountain


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>