This adds wait states to the NVM update state machine to signify when
waiting for an update operation to finish, whether we're in the middle
of a set of Write operations, or we're now idle but waiting.

Change-ID: Iabe91d6579ef6a2ea560647e374035656211ab43
Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>