[PATCH v2 0/4] JZ4740 watchdog cleanups

[Paul Cercueil]

V1 patchset didn't apply anymore on v5.2-rc3 so I rebased on top of it.
The previous patch 4/4 (which added SPDX license notifier) has been
dropped since somebody else did the job in -rc3.
So I added another cleanup as patch 4/4, and I tweaked patch 2/4 to
adjust to Guenter's feedback on V1.

Cheers
-Paul