[RFC v4 13/26] watchdog: renesas_wdt: Add restart handler

[Wolfram Sang]

> > I used to have this simpler version (back then for the UP case):
> >
> > +rwdt_start(wdev);
> > +rwdt_write(priv, 0xffff, RWTCNT);
> > +return 0;
> >
> > It should still work probably...
> 
> It should still work, but it would be slower, I would stick with the
> version I have submitted if you don't mind.

Actually, I do mind. Because of code duplication reasons. We have a fix
in the works for rwdt_start() and it would be too easy to overlook the
same fix will be needed for a restart.

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