can: at91_can: ECR register: convert to FIELD_GET()

Use FIELD_GET() to access the individual fields of the ECR register.

Link: https://lore.kernel.org/all/20231005-at91_can-rx_offload-v2-5-9987d53600e0@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2023-04-18 16:35:54 +02:00
commit abe1348753