ath6kl: add firmware log support

Firmware sends binary logs with WMIX_DBGLOG_EVENTID event. Create
a buffer which stores the latest logs and which can be copied from
fwlog debugfs file with cp command.

To save memory firmware log support is enabled only when CONFIG_ATH6KL_DEBUG
is enabled.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath6kl/target.h b/drivers/net/wireless/ath/ath6kl/target.h
index 53e2c78..6c66a08 100644
--- a/drivers/net/wireless/ath/ath6kl/target.h
+++ b/drivers/net/wireless/ath/ath6kl/target.h
@@ -340,4 +340,7 @@
 #define AR6004_REV1_BOARD_DATA_ADDRESS          0x435400
 #define AR6004_REV1_BOARD_EXT_DATA_ADDRESS      0x437000
 #define AR6004_REV1_RAM_RESERVE_SIZE            11264
+
+#define ATH6KL_FWLOG_PAYLOAD_SIZE		1500
+
 #endif