sl/mnt OK, lukas.

Common watchdog properties.

Optional properties:
- timeout-sec : Timeout of the watchdog in seconds
		If this timeout is not defined, the value of
		be used instead.
- hw_margin_ms : Period used to reset the watchdog in ms
		 If this period is not defined, the default value is 1000.
- u-boot,noautostart :
- u-boot,autostart : These (mutually exclusive) boolean properties can be used to
		     whether the watchdog is automatically started when probed.
		     If neither
		     are present, the behaviour is determined by the config option