sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

sound: clean up empty lines in .c and .h files

sys/dev: further adoption of SPDX licensing ID tags.

Mainly focus on files that use BSD 2-Clause license, however the tool I
was using misidentified many licenses so this was mostly a manual - error
prone - task.

The Software Package Data Exchange (SPDX) group provides a specification
to make it easier for automated tools to detect and summarize well known
opensource licenses. We are gradually adopting the specification, noting
that the tags are considered only advisory and do not, in any way,
superceed or replace the license texts.

A new jail(8) with a configuration file, to replace the work currently done
by /etc/rc.d/jail.

- Import the HEAD csup code which is the basis for the cvsmode work.

Start each of the license/copyright comments with /*-, minor shuffle of lines

Switch from legacy to native mode for ICH4 and ICH5.

Submitted by: Shin-ichi YOSHIMOTO <yosimoto@waishi.jp>
Test by: Markko Merzin <markko@short.cut.ee>
PR: kern/53242
MFC after: 5 days

Cater for ich4 quirks.

Reported by: Jacob Rhoden
Tested by: Jacob Rhoden, mp

* simplify

* add support for mic record channel

* add support for setblocksize

* make mpsafe

* make getptr accurate

* reduce buffer size from 64k to 16k for better synchronisation