[qca-nss-drv]: Improve N2H payloads stats

Improve N2H payload accounting in NSS FW

Change-Id: Ifeb83f570a7220e8e82aa868bb0e67614804c3c1
Signed-off-by: Saurabh Misra <smisra@codeaurora.org>
diff --git a/nss_stats.c b/nss_stats.c
index d5ed3e5..b5f1373 100644
--- a/nss_stats.c
+++ b/nss_stats.c
@@ -150,6 +150,7 @@
 	"h2n_data_bytes",
 	"n2h_data_packets",
 	"n2h_data_bytes",
+	"n2h_tot_payloads",
 };
 
 /*