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/

acpi_ged: Module build no longer needs to define INTRNG

Now that we properly define INTRNG generically on all the platforms that
need it in opt_global.h, we don't need to define it here.

Sponsored

acpi_ged: Module build no longer needs to define INTRNG

Now that we properly define INTRNG generically on all the platforms that
need it in opt_global.h, we don't need to define it here.

Sponsored by: Netflix
Reviewed by: kevans
Differential Revision: https://reviews.freebsd.org/D37110

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acpi_ged: fix build, as module and non INTRNG case.

Reviewed-by: cy

Differential Revision: https://reviews.freebsd.org/D37104

acpi_ged: New driver to ACPI generic event device

New driver to ACPI generic event device, defined in ACPI spec.
Some ACPI power button may not work without this.

In qemu arm64 with "virt" machin

acpi_ged: New driver to ACPI generic event device

New driver to ACPI generic event device, defined in ACPI spec.
Some ACPI power button may not work without this.

In qemu arm64 with "virt" machine, with ACPI firmware,
enable devd check devd message by
and invoke following command in qemu monitor
(qemu) system_powerdown
and make sure some power button input event appear.
(setting sysctl hw.acpi.power_button_state=S5 is not work,
because ACPI tree does not have \_S5 object.)

Reviewed by: andrew, hrs
Differential Revision: https://reviews.freebsd.org/D37032

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