devd: Improve devmatch support

We know that calling devmatch will be futile if there's no plug and play
information for it to match on. Avoid this generically when we see
"? at +on"
which happens only when the location and pnpinfo aren't provided. Don't
call "service devmatch quietstart" here.

We also ignore ACPI devices with a _HID of none. These also will never
load a new driver, so avoid calling "service devmatch quietstart" here too.

Use the more compatct "$*" instead of "'?'$_" when calling "service
devmatch quietstart" since it will evaluate to the same thing.

On my laptop, this eliminates 45% of the calls to devmatch. While it
would be even better to integrate devmatch into devd (so we only parse
linker.hints once), that will have to wait for another day as it's a bit
more complex to arrange that avoiding easy to avoid calls.

Sponsored by: Netflix
Reviewed by: emaste
Differential Revision: https://reviews.freebsd.org/D42326

Remove $FreeBSD$: one-line sh pattern

Remove /^\s*#[#!]?\s*\$FreeBSD\$.*$\n/

Move all devd related configs to sbin/devd/

This helps with pkgbase as it switches these to using CONFS so they are
properly tagged as config files.

Approved by: will (mentor), imp
Differential Revision: https://reviews.freebsd.org/D16781