rsu(4) does not require legal.realtek.license_ack=1

[0mp]

Summary

The rsu firmware license check has been disabled since r292756.

Proposed changes:

• Do not suggest to add legal.realtek.license_ack=1 to loader.conf(5) as it is no longer required. The rtwn(4) man page does not mention already.
• Add device rsufw to the kernel configuration lines (similarly to iwi(4)).
• Reference the license file in the files section (similarly to rtwn(4)).
• Update the path to the license file in rsufw(4).

Interestingly, @vidwer_fbsdbugs_gmail.com was able to use rsu(4) loading firmware in loader.conf(5). I couldn't verify this so I kept firmware parts in the rsu manual.

[bcr]

OK from manpages. Bump the .Dd when you do the actual commit (once network has approved, too). Thanks for working on this!

[0mp]

In D14966#314881, @bcr wrote:

Bump the .Dd when you do the actual commit (once network has approved, too).

I'll remember about it. Thanks!

[0mp]

@kevans suggested that I should remove the network team from reviewers as there's little overlap between WiFi people and the network team.