drivers: usb_dc_mcux_ehci: rework USB_DeviceNotificationTrigger()
drivers: usb_dc_mcux_ehci: rework USB_DeviceNotificationTrigger()

Rework USB_DeviceNotificationTrigger(). Fix style.

Drop messages from USB_DeviceEhciCancel().
MCUX EHCI driver notifies about canceled transfers,
but there is no specific code for this event in
usb_device_callback_message_struct_t, the only way to
recognize it is to check the length value.

Signed-off-by: Johann Fischer <b39b26e1812eb092eb217277792f3735321fa456@phytec.de>

finikorg/zephyr,nashif/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,galak/zephyr,galak/zephyr,galak/zephyr,Vudentz/zephyr,finikorg/zephyr,zephyrproject-rtos/zephyr,galak/zephyr,Vudentz/zephyr,nashif/zephyr,Vudentz/zephyr,zephyrproject-rtos/zephyr,Vudentz/zephyr,Vudentz/zephyr,finikorg/zephyr,nashif/zephyr,zephyrproject-rtos/zephyr,finikorg/zephyr,finikorg/zephyr,galak/zephyr,zephyrproject-rtos/zephyr,nashif/zephyr