staging/mei: AMT Watchdog

code that open connection and invoke
heartbeats to the AMT Watchdog client/feature, if exists

Connect to WD Client, if exists Send Start WD Command.
Every 2 secs send heartbeats.
On System shutdown/suspends, send Stop WD command.

This is intermediate stage before moving this code to standalone watchdog
driver.

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Itzhak Tzeel-Krupp <itzhak.tzeel-krupp@intel.com>
Signed-off-by: Oren Weil <oren.jer.weil@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>