The STM32G0 soc has 2 CAN controllers. The 2nd on was not working
with zephyr yet as both controllers shares the same IRQ. Recently, the
shared irq system was integrated on now, both can controllers can work
on this chip. Shared interrupts must be enabled only if both can
controllers are enabled.
Signed-off-by: Adrien MARTIN <adrienmar@kickmaker.net>