drivers: can: Add SocketCAN support to mcux flexcan driver
drivers: can: Add SocketCAN support to mcux flexcan driver

Used the SocketCAN initalization code from the can_stm32.c driver which
successfully initializes SocketCAN for the Flexcan driver

Signed-off-by: Peter van der Perk <a7bd9f67653ac7cc167a0295f3797f123a430123@nxp.com>

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