can: peak_pci: convert comments to network style comments

This patch converts all comments to network subsystem style comments.

Cc: Stephane Grosjean <s.grosjean@peak-system.com>
Link: https://lore.kernel.org/r/20210616102811.2449426-8-mkl@pengutronix.de


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