tests: drivers: can: Add test for TX callback
tests: drivers: can: Add test for TX callback

No test verifies a TX callback for successful transfers.
This commit adds a test for those callbacks.

Signed-off-by: Alexander Wachter <ce6e77dabd455f5e273537afd862be63bdedff84@student.tugraz.at>

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