pkgbase: Add a FreeBSD-hostapd package

Move the hostapd related files from FreeBSD-runtime to a new package n
FreeBSD-hostapd
The FreeBSD runtime is only intended to have everything for a working
FreeBSD installation and hostapd isn't needed for that.

Reviewed by: bapt, gjb
Differential Revision: https://reviews.freebsd.org/D20958