qcacld-3.0: Update the channel only if AUTH resp is successful

Currently channel is updated whenever AUTH frame is received
irrespective of its status. So in case of unsuccessful AUTH
wrong channel is updated in pkt capture mode.

To fix this issue, update the channel only if AUTH response
is successful. Also if after AUTH success, association or
reassociation fails update the channel with last connected
channel.

Change-Id: I51ee6bb2466f765ce6058c411b0dc0ab74a0dd04
CRs-Fixed: 2987748