Rename the /usr/share/doc/legal files to driver.LICENSE to work around
bug of installing 'realtek' and 'intel_iwn' as files rather then as
a 'LICENSE' file in their directories.

Also add obsolete entries for the older names and names that existed in head
for a period of time.

Suggested by: jmg
X-MFC-With: r289391
MFC after: 3 weeks
Sponsored by: EMC / Isilon Storage Division