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

Remove /^/[*/]\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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

Implement the USB_GET_DEVICEINFO ioctl(2) for uhid(4).

Submitted by: pedro martelletto <pedro@ambientworks.net>
MFC after: 1 week
Sponsored by: Mellanox Technologies // NVIDIA Networking

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.

Fix _USB2_* refernces in the header protection defines.

s/usb2_/usb_|usbd_/ on all function names for the USB stack.

s/usb2_/usb_/ on all C structs for the USB stack.

Move the new USB stack into its new home.