Revert "ACPI: EC: Evaluate orphan _REG under EC device"

This reverts commit 0e6b6ded ("Revert "ACPI: EC: Evaluate orphan
_REG under EC device") because the problem addressed by it will be
addressed differently in what follows.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Cc: All applicable <stable@vger.kernel.org>
Link: https://patch.msgid.link/3236716.5fSG56mABF@rjwysocki.net