Add the interface layers APIs that will be utilized by the mlme
module to interface with the serialization module.
Also add a serialization command cancel option to cancel cmds of a vdev
belonging to a given command type and define the vdev mlme legacy callback
function that will be used by the mlme-serialization interface APIs
Change-Id: I6a376465ef2929f15c6464bbd29c0250251696d8
CRs-Fixed: 2312821
9c61c1fb03