mei: add async event notification ioctls

Add ioctl IOCTL_MEI_NOTIFY_SET for enabling and disabling
async event notification.
Add ioctl IOCTL_MEI_NOTIFY_GET for receiving and acking
an event notification.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc Documentation/ioctl/ioctl-number.txt
Simple merge

diff --cc Documentation/misc-devices/mei/mei.txt
Simple merge

diff --cc drivers/misc/mei/main.c
Simple merge

diff --cc include/uapi/linux/mei.h
Simple merge