watchdog: Add a driver for the Apple watchdog

This driver supports the watchdog timer found on Apple's M1 SoC.
On systems that use these SoC, the watchdog timer is the primary
way to reboot the system.

Signed-off-by: Mark Kettenis <[email protected]>
Reviewed-by: Sven Peter <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Reviewed-by: Stefan Roese <[email protected]>
Tested-on: Apple M1 Macbook
Tested-by: Simon Glass <[email protected]>

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