watchdog: versal: Use new compatible xlnx,versal-wwdt

DT binding has been approved that's why use new compatible string.
The old one is mark as deprecated and should be removed after some
releases.

Link: https://lore.kernel.org/r/20230420104231.2243079-3-srinivas.neeli@amd.com/
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/6e78d0d2e21f2f9e7f8f448bb8e0d27ced4de7d3.1686655339.git.michal.simek@amd.com
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