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

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

LinuxKPI: pm.h: add dummy pm_wakeup_event()

Add a dummy implementation of pm_wakeup_event() which is used to notify
the power management system about a wakeup (which we currently do not
implement yet).

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D38239

LinuxKPI: pm.h add pm_sleep_ptr and DEFINE_SIMPLE_DEV_PM_OPS

Extend pm.h by pm_sleep_ptr and DEFINE_SIMPLE_DEV_PM_OPS().
For the moment this duplicates some parts (as can be seen in the earlier
review I tried to simplify bits but given our implementation this
was easier in the end).

While here and cleanup the SIMPLE_DEV_PM_OPS() bits (white-space only).

MFC after: 3 days
Reviewed by: hselasky
Differential Revision: https://reviews.freebsd.org/D37527

LinuxKPI: Add pci_power querying for drm-kmod

Adds a few struct members and a function to get i915_runtime_pm_status()
to compile in drm-kmod.

Differential Revision: https://reviews.freebsd.org/D36749
Sponsored by: Google, Inc. (GSoC 2022)

linuxkpi: pm: Add more defines and includes

Needed by drm-kmod.

Reviewed By: emaste, hselasky
Obtained from: drm-kmod
Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D36024

LinuxKPI: move pm_message_t from kernel.h to pm.h

Move pm_message_t from kernel.h to pm.h and remove a private define
in usb.h as well as adjust the implementation in linux_usb.c.
This cleans up what I believe to be a historic shortcut and is
needed for future wireless driver updates.

Leave a note in UPDATING that drm-kmod users need to update to the
latest version before re-compiling a new kernel to avoid errors
(see PR).

Sponsored by: The FreeBSD Foundation
MFC after: 3 days
PR: 264449 (drm-kmod port update, thanks wulf)
Obtained from: bz_git_iwlwifi (Dec 2020) (partly)
Reviewed by: hselasky, imp
Differential Revision: https://reviews.freebsd.org/D35276

LinuxKPI: upstream a collection of drm-kmod conflicting changes

The upcoming in-kernel implementations for LinuxKPI based on work on
iwlwifi (and other wireless drivers) conflicts in a few places with
the drm-kmod graphics work outside the base system.

In order to transition smoothly extract the conflicting bits.
This included "unaligned" accessor functions, sg_pcopy_from_buffer(),
IS_*() macros (to be further restricted in the future), power management
bits (possibly no longer conflicting with DRM), and other minor changes.

Obtained-from: bz_iwlwifi
Sponsored-by: The FreeBSD Foundation
MFC after: 3 days
Reviewed by: kib, hselasky, manu, bdragon (looked at earlier versions)
Differential Revision: https://reviews.freebsd.org/D26598