[qca-nss-drv] Adjust flush size when re-using buffers

The transmit buffer size might be smaller that our receive
size in the re-use case. The difference could be dirty
in the cache and it is our driver’s responsibility to flush
the difference between the tx portion and the addition bytes
we will receive after the buffer is re-used.

Change-Id: I248b425bb1fc2bd777eac85d8a19803de297104f
Signed-off-by: Murat Sezgin <msezgin@codeaurora.org>
diff --git a/nss_stats.c b/nss_stats.c
index e9228cb..5d971ad 100644
--- a/nss_stats.c
+++ b/nss_stats.c
@@ -173,6 +173,7 @@
 	"tx_buffers_pkt",
 	"tx_buffers_cmd",
 	"tx_buffers_crypto",
+	"tx_buffers_reuse",
 	"rx_buffers_empty",
 	"rx_buffers_pkt",
 	"rx_buffers_cmd_resp",