xen: add proper copyright attribution

Noted by:	jmallett


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272162 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Fix typos.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272163 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Fix the size of AT91SAM9260_PIT_SIZE.


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272164 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Add very basic outline man page for smsc(4).

MFC after:	6 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@272165 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f