can: mcan: sjw-data devicetree configuration is not written correctly

[Urist-McGit]

Describe the bug
When setting the sjw-data field on M_CAN devicetree nodes the values are not written in the correct registers.

To Reproduce

1. Configure sjw-data field on any M_CAN node
2. Build the example under samples/drivers/can/ with CANFD enabled
3. Run the example.

Expected behavior
The configured sjw-data is written to the to DBTP register.

Impact
The configured value is not respected. The NBTP register configuration gets destroyed in the process. This may cause the M_CAN module to not work as expected.

Environment :

• OS: Debian 11 Testing
• Toolchain: Zephyr SDK
• Commit SHA: bfd2719

Additional context
I have proposed a fix for this issue here: #35948