can: m_can: remove a copy of the NAPI_POLL_WEIGHT define

Defining local versions of NAPI_POLL_WEIGHT with the same values in
the drivers just makes refactoring harder.

Link: https://lore.kernel.org/all/20220429174446.196655-1-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>