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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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

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qcom: add initial SCM legacy API

This is a very simple implementation of Qualcomm's SCM API.

It is just the structure/field definitions and the atomic SCM
call which doesn't use the structs yet - i

qcom: add initial SCM legacy API

This is a very simple implementation of Qualcomm's SCM API.

It is just the structure/field definitions and the atomic SCM
call which doesn't use the structs yet - it uses the field
definitions inside registers.

I've tested that setting the cold boot address via the atomic
API is fine - Linux does the same thing. But not all SCM calls
can be done via the legacy API.

This is a reimplementation based on the Linux qualcomm SCM legacy
code and definitions.

Tested:

* Qualcomm IPQ4018 AP, as part of other changes for doing SMP bring-up

Reviewed by: andrew, manu, imp
Differential Revision: https://reviews.freebsd.org/D32723

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