sys: Remove $FreeBSD$: one-line sh pattern

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

hid: add opt_hid.h to modules that use HID_DEBUG

Submitted by: Greg V <greg_AT_unrelenting_DOT_technology>
Reviewed by: imp, wulf
MFC after: 1 week
Differential revision: https://reviews.freebsd.org/D28995

hid: Port ukbd to HID and attach to build

Reviewed by: hselasky
Differential revision: https://reviews.freebsd.org/D27991