sys: Remove $FreeBSD$: one-line .c pattern

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

Fix typo on "Celsius"

"Celcius" --> "Celsius"

Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Pull Request: https://github.com/freebsd/freebsd-src/pull/551/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.

cxgb: replace r273280 with a more comprehensive fix.

Poll for link state when the link is down, even for interrupt capable
PHYs.

Allow PHYs to report a dubious "partial" link. If this state is seen 3
consecutive times (each check is ~1s apart) then reset the PHY. This is
a workaround for a situation where repeatedly toggling the link from the
peer gets the AEL2005 PHY into a state where it never establishes a PCS
block lock even when everything is in order.

MFC after: 1 week

Fix return value of function.

Submitted by: Dan McGregor <dan dot mcgregor at usask dot ca>

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

MFC r199237, r199238, r199239, r199240, r200003

r199237:
sc->rev and is_offload(sc) will always be 0 during probe. Wait till
attach to get correct values.

r199238:
Make sure *some* edc is setup even for an unknown transceiver (assume
it is optical).

r199239:
The 10GBASE-T card should use an IPG of 1. Also enable the check
for low power startup on this card.

r199240:
Don't disable the XGMAC's tx on ifconfig down. It is unnecessary
and can cause false backpressure in the chip. Fix a us/ms mixup
while here.

r200003:
T3 firmware 7.8.0 for cxgb(4)

The 10GBASE-T card should use an IPG of 1. Also enable the check
for low power startup on this card.

MFC r197791

cxgb(4) updates, including:
- support for the new Gen-2, BT, and LP-CR cards.
- T3 firmware 7.7.0
- shared "common code" updates.

cxgb(4) updates, including:
- support for the new Gen-2, BT, and LP-CR cards.
- T3 firmware 7.7.0
- shared "common code" updates.

Approved by: gnn (mentor)
Obtained from: Chelsio
MFC after: 1 month