The CSR bit is already cleared when arriving here so remove this section of
duplicate code.

The registers set in m_can_config_endisable() is set to same exact values as
before this patch.
Signed-off-by: Sean Nyekjaer <sean@geanix.com>
Acked-by: Sriram Dash <sriram.dash@samsung.com>
Acked-by: Dan Murphy <dmurphy@ti.com>
Link: https://lore.kernel.org/r/20191211063227.84259-1-sean@geanix.com
Fixes: f524f829 ("can: m_can: Create a m_can platform framework")
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>