Fix the watchdog/watchdog man pages.

The default timeout is 128 seconds.

MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273247 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
AM335x FDT: add an entry for the watchdog.

MFC after:	1 week


git-svn-id: svn+ssh://svn.freebsd.org/base/head@273248 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f