TDLS peer discovery count is incremented every time after
TDLS discovery frame is queued for the peer till max attempts
are reached. But sometimes due to host or firmware scan the
frames could get flushed and still the discovery attempts
counter is incremented resulting in reduced possibility of
discovering the peer.
So increment TDLS discovery attempts after successful
tx completion of the TDLS discovery frames.
CRs-Fixed: 3647289
Change-Id: I7e3fe1973b34276ed5ea20a7114f3635ed59c6ef
3d6edc5fb8