Remove residual blank line at start of Makefile

This is a residual of the $FreeBSD$ removal.

MFC After: 3 days (though I'll just run the command on the branches)
Sponsored by: Netflix

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

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

qat: Rename to qat_c2xxx and remove support for modern chipsets

A replacement QAT driver will be imported, but this replacement does not
support Atom C2xxx hardware. So, the existing driver will be

qat: Rename to qat_c2xxx and remove support for modern chipsets

A replacement QAT driver will be imported, but this replacement does not
support Atom C2xxx hardware. So, the existing driver will be kept
around to provide opencrypto offload support for those chipsets.

Reviewed by: pauamma, emaste
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D35817

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