docs: networking: device drivers: flexcan: fix invalid email

The Amarula contact info email address is wrong, so fix it up to use the
correct one.

Signed-off-by: Dario Binacchi <dario.binacchi@amarulasolutions.com>
Link: https://lore.kernel.org/all/20220828134442.794990-1-dario.binacchi@amarulasolutions.com


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>