Staging: add heci driver

Staging: add heci driver

The Intel Management Engine Interface (aka HECI: Host Embedded
Controller Interface ) enables communication between the host OS and
the Management Engine firmware. MEI is bi-directional, and either the
host or Intel AMT firmware can initiate transactions.

The core hardware architecture of Intel Active Management Technology
(Intel AMT) is resident in firmware. The micro-controller within the
chipset's graphics and memory controller (GMCH) hub houses the
Management Engine (ME) firmware, which implements various services
on behalf of management applications.

Some of the ME subsystems that can be access via MEI driver:

- Intel(R) Quiet System Technology (QST) is implemented as a firmware
subsystem  that  runs in the ME.  Programs that wish to expose the
health monitoring and fan speed control capabilities of Intel(R) QST
will need to use the MEI driver to communicate with the ME sub-system.
- ASF is the "Alert Standard Format" which is an DMTF manageability
standard. It is implemented in the PC's hardware and firmware, and is
managed from a remote console.

Most recent Intel desktop chipsets have one or more of the above ME
services. The MEI driver will make it possible to support the above
features on Linux and provides applications access to the ME and it's
features.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>
Signed-off-by: Marcin Obara <marcin.obara@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>