linux-wandboard

can: at91_can: register mb0 sysfs entry only on at91sam9263

This patch prepares the driver for the at91sam9X5 processors,
which don't have the mb0 bug.
(See commit 3a5655a5b545e9647c3437473ee3d815fe1b9050 for more details.)

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