[MPCore Watchdog]: Convert from misc_dev to dynamic device node.

Hi All,

quoted

I've added Wim (watchdog driver maintainer), but I would think that if
this change is worth doing then it should be done for all drivers.

Agreed, but today this may be more work than I'm strictly interested in
doing. If we do decide it's the right thing then I'll look into converting the
other drivers later.

No, we need to do it by first converting all drivers to the new API and then a
change of the API will take care of it.

Kind regards,
Wim.