MFC r328985:
Give USB template SYSUNINIT()'s a uniq name to avoid symbol name collision
when building stand/usb. Regression after r328194.

Sponsored by: Mellanox Technologies

MFC r328219:

Add missing manufacturer/serial number string descriptors.

MFC r328196:

Add missing SPDX tags; the rest of the license text is the same as in other
USB templates.

MFC r328194:

Add sysctls to control device side USB identifiers. This makes it
possible to change string and numeric vendor and product identifiers,
as well as anything else there might be to change for a particular
device side template, eg the MAC address.

Relnotes: yes

MFC r324626:

Replace some magic numbers in usb_template(4) code with #defines.
There should be no functional changes.

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add new USB phone descriptor template for USB device side mode.

MFC after: 3 days