Finally fix problem discussed in this old thread:
http://mail-index.netbsd.org/tech-kern/2017/12/03/msg022661.html

Dell's radio hotkey sends a PMFE_RADIO_TOGGLE event, but nothing actually
listen to

Finally fix problem discussed in this old thread:
http://mail-index.netbsd.org/tech-kern/2017/12/03/msg022661.html

Dell's radio hotkey sends a PMFE_RADIO_TOGGLE event, but nothing actually
listen to it.
Turn it into a PSWITCH_HK_WIRELESS_BUTTON hotkey, similar to
what thinkpad_acpi.c does.
Add type/subtypes seen on a Dell lattitude 5480 laptop.
XXX we need a PMFE_AUDIO_MICRO_TOGGLE, and something to handle it.

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make this compile again and:
- remove extra space
- use alternate form %x printing
- use aprint_debug_dev instead of printf

Fix dell WMI mappings:
- query the descriptor to get the interface version, needed to workaround
a bug in the BIOS/ACPI
- properly decode the event buffer in type/subtype, and handle multiple event

Fix dell WMI mappings:
- query the descriptor to get the interface version, needed to workaround
a bug in the BIOS/ACPI
- properly decode the event buffer in type/subtype, and handle multiple events
per handler call
- record some known type/subtype in a table, with associated actions.

Informations mostly from linux. Tested on a Dell 5480 laptop.

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Update module dependencies for all the existing modules that depend on sysmon components.

Make the WMI modules depend on the parent mapper.

Convert the homegrown module declarations to use ioconf.

Bump WARNS to 4.

add support for building as modules

Initialize pointers to NULL. Otherwise we may try to free garbage.
Tries to address a panic reported by David Demelier in PR kern/43504.

Move acpiwmi(4) to the "sys/dev/acpi/wmi" -subdirectory.

Add a dummy acpi_wmi_event_deregister() to match existing conventions.

Add WMI mappings for Dell laptops. Requested and tested by mrg@.