[qca-nss-drv] fix issue with ppe stats

Changes to move ppe pvt context into c file, this was declared
in .h file with some recent changes, which has broken ppe stats.

Change-Id: I3abf14e83cd4180c660da5f7029a32336b21d5d9
Signed-off-by: Amit Gupta <amitgupt@codeaurora.org>
diff --git a/nss_ppe.c b/nss_ppe.c
index 1a07cdb..b81c454 100644
--- a/nss_ppe.c
+++ b/nss_ppe.c
@@ -17,6 +17,8 @@
 #include "nss_ppe.h"
 #include "nss_ppe_stats.h"
 
+struct nss_ppe_stats_debug nss_ppe_debug_stats;
+
 /*
  * nss_ppe_verify_ifnum()
  *	Verify PPE interface number.