Introduce support for Systems Management Driver over WMI for Dell Systems

[Anthony Wong]

The Dell WMI Systems Management Driver provides a sysfs
interface for systems management to enable BIOS configuration
capability on certain Dell Systems.

This driver allows user to configure Dell systems with a
uniform common interface. To facilitate this, the patch
introduces a generic way for driver to be able to create
configurable BIOS Attributes available in Setup (F2) screen.

[Impact]
This provides a huge benefit to Dell machines users to be able to manipulate BIOS settings from within Ubuntu.

[Fix]
By the patches: https://www.spinics.net/lists/platform-driver-x86/msg23302.html
Maintainer has merged the code to his branch:
https://www.spinics.net/lists/platform-driver-x86/msg23313.html

[Test Case]

[Regression Risk]
This is a new driver and self-contained.