Revert: "dell-laptop: Toggle the unsupported hardware killswitch"

Revert: "dell-laptop: Toggle the unsupported hardware killswitch"

commit be65dde82a4a402e9607c2f306f343bf0912623c upstream.

This reverts commit a3d77411e8b2ad661958c1fbee65beb476ec6d70,

as it causes a mess in the wireless rfkill status on some models.
It is probably a bad idea to toggle the rfkill for all dell models
without the respect to the claim that it is hardware-controlled.

Signed-off-by: Keng-Yu Lin <kengyu@canonical.com>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>