ath6kl: add tracing support and tracing points for wmi packets

Add basic tracing infrastructure support to ath6kl and which can be
enabled with CONFIG_ATH6KL_TRACING.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath6kl/wmi.c b/drivers/net/wireless/ath/ath6kl/wmi.c
index d76b5bd..31a3081 100644
--- a/drivers/net/wireless/ath/ath6kl/wmi.c
+++ b/drivers/net/wireless/ath/ath6kl/wmi.c
@@ -20,6 +20,7 @@
 #include "core.h"
 #include "debug.h"
 #include "testmode.h"
+#include "trace.h"
 #include "../regd.h"
 #include "../regd_common.h"
 
@@ -4086,6 +4087,8 @@
 		return -EINVAL;
 	}
 
+	trace_ath6kl_wmi_event(skb->data, skb->len);
+
 	return ath6kl_wmi_proc_events(wmi, skb);
 }