qcacmn: Set invalid bit in cookie for exception ring descriptor
On returning the msdu link descriptor to HW via WBM release ring, the rx exception ring contents are not zeroed. This could result in host reading stale ring descriptor content in the scenario when HP is updated even before the latest values are reflected in the ring descriptor. Fix is to set invalid bit in cookie for exception ring descriptor and add cookie sanity check. Change-Id: I01a294c92b260ebe8e584ef20e9550b1febec913 CRs-Fixed: 2730759
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