Presently upon interface up a message is posted to the scheduler
to create the vdev, which sends the vdev create to the firmware,
for the vdev create there is no response from the firmware host
internally posts a fake message internally for the vdev create
response.
Dont post the vdev create to the scheduler thread but directly
send the vdev create to the firmware in the caller context.
Change-Id: Iafb186b13d948e421d152c3142cb8614fdbbffa6
CRs-Fixed: 2549530
bcd5634dae