Document the use of the vfs.nfsd sysctls that control the size of
the NFS server's DRC for TCP.
This is a content change.

MFC after:	1 week
Fix two files forgotten in r269783 (vt_generate_cons_palette)

Reported by:	bz
MFC after:	1 week
MFC with:	269783
Add some more OS_MARK() probes to the AR9300 HAL.
- Remove unneeded include.

Phabric:	D563
Reviewed by:	kevlo
Approved by:	kevlo