In SAP if a peer is disconnecting, so CSR roamstate is set to
eCSR_ROAMING_STATE_JOINING. Now if at the same time another peer
is trying to connect, eWNI_SME_UPPER_LAYER_ASSOC_CNF will be dropped
in eCSR_ROAMING_STATE_JOINING state.
Fix this by processing eWNI_SME_UPPER_LAYER_ASSOC_CNF in
eCSR_ROAMING_STATE_JOINING state.
Change-Id: I7d4347013eca494e537aaeb4468814238cb3fca6
CRs-Fixed: 2430840