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

Remove /^[\s*]*__FBSDID\("\$FreeBSD\$"\);?\s*\n/

rtwn_pci(4): add support for RTL8188EE chipset.

Initially based on https://reviews.freebsd.org/D15692;
later deduplicated and improved a bit (Tx reports, IQ calibration support).

Submitted by: Farhan Khan <khanzf@gmail.com>
MFC after: 4 days
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D15692