spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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spdx: The BSD-2-Clause-FreeBSD identifier is obsolete, drop -FreeBSD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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powerpc powermac: Remove unused devclass arguments to DRIVER_MODULE.

[PowerPC] PowerMac timebase sync for G4

Summary:
Disable timebase on (some) AIM platforms (tested on PowerMac G4) prior
to synchronization.

Some platforms use a GPIO to enable and disable timebase,

[PowerPC] PowerMac timebase sync for G4

Summary:
Disable timebase on (some) AIM platforms (tested on PowerMac G4) prior
to synchronization.

Some platforms use a GPIO to enable and disable timebase, while others
use a platform function.

This mirrors 0d69f00b on mpc85xx.

Todo:
* Implement various G5 timebase controls.
* Print out platform code on unknown G5s so we can collect it.
* Change API to be give/take pairs like Linux does so it's possible to
do a software sync protocol.

Reviewed By: #powerpc, jhibbits
Subscribers: mikael, markmi_dsl-only.net, luporl, alfredo
Tags: #powerpc
Differential Revision: https://reviews.freebsd.org/D29136

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