drivers: can: calculate a default SJW value

Change the CAN timing calculation APIs to automatically calculate a default
(Re-)Synchronization Jump Width (SJW) value. The calculated value can be
overwritten by the caller if desired.

This allows automatically scaling the SJW according to the number of Time
Quanta (TQ) used for phase segment 2 instead of relying on a compile-time
fallback value defined in devicetree.

This reduces the can_set_timing()/can_set_timing_data() API functions to
simple setters (with validation).

Fixes: #63033

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