sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD

The SPDX folks have obsoleted the BSD-2-Clause-FreeBSD identifier. Catch
up to that fact and revert to their recommended match of BSD-2-Clause.

Discussed with: pfg
MFC After: 3 days
Sponsored by: Netflix

qcom_clk: add the qualcomm clock nodes for the IPQ4018

These clock nodes are used by the IPQ4018/IPQ4019 and derivatives.
They're also used by other 32 and 64 bit qualcomm parts; so it's
best to put these nodes here in a single qcom_clk driver and add
to it as we grow new Qualcomm SoC support.

Tested:

* IPQ4018, boot

Differential Revision: https://reviews.freebsd.org/D33665