qcacld-3.0: Cleanup rrm measurement data based on the index

Currently when rrm measurement is completed for a particular
index, the rrm_cleanup() is called which clears the measurement
data for all the index. This can cause failure with multiple
measurement request where on completion of the first request,
second request data structure will also be made null.

Pass the measurement index to rrm_cleanup() and clear only
that index data.

Change-Id: Ib712c2da3ddfea374d60b250dd474b08093b24c7
CRs-Fixed: 2695836