Staging: hv: Added new hv_utils driver with shutdown as first functionality

Addition of new driver for Hyper-V called hv_utils.
This driver is intended to support things like KVP, Timesync, Heartbeat etc.

This first release has support for Gracefull shutdown.
e.g. Select shutdown from the Hyper-V main admin screen and the Linux VM
will do a gracefull shutdown.

Signed-off-by: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>