[qca-nss-drv] Use clean for writing prod idx

Use clean (writeback only) instead of flush
(invalidate + writeback) for producer index.

Change-Id: I3d043d9f1fef8fc9e74e97199b4569f177e6854c
Signed-off-by: Selin Dag <sdag@codeaurora.org>
1 file changed