can: etas_es58x: remove DRV_VERSION

can: etas_es58x: remove DRV_VERSION

DRV_VERSION is a leftover from when the driver was an out of tree
module. The driver version was never incremented despite of the
numerous changes made since it was mainstreamed. Keeping an
unmaintained driver version number makes no sense. Remove it and rely
on the kernel version instead.

Signed-off-by: Vincent Mailhol <mailhol.vincent@wanadoo.fr>
Link: https://lore.kernel.org/all/20220726082707.58758-11-mailhol.vincent@wanadoo.fr
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>