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pkgbase: Move the bootloader related files to a new FreeBSD-bootloader package

Description

pkgbase: Move the bootloader related files to a new FreeBSD-bootloader package

Bootloader file isn't needed for jails so don't include it in FreeBSD-runtime.

Reviewed by: bapt, delphij, gjb
Differential Revision: https://reviews.freebsd.org/D21496