can: m_can: remove not used variable struct m_can_classdev::freq

This patch removes the unused variable freq from the struct m_can_classdev.

Link: https://lore.kernel.org/r/20201130133713.269256-5-mkl@pengutronix.de


Reviewed-by: Dan Murphy <dmurphy@ti.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>