drivers: can: unify CAN controller configuration in devicetree

Unify the CAN controller configuration done in Zephyr devicetrees:

- Specify a resynchronization jump width (sjw) of 1 time quanta in SoC
  devicetrees as this is the most common. Boards can override this if
  needed.
- Specify a sample point of 87.5% as recommended by CAN in Automation
  (CiA) in SoC devicetrees. Boards can override this if needed.
- Specify a bus speed of 125 kbits/second (arbitration phase) and 1
  Mbits/second (CAN-FD data phase) in board devicetrees as this is what
  is used by all Zephyr CAN samples.

Signed-off-by: Henrik Brix Andersen <hebad@vestas.com>