ath6kl: add debug logs for booting

Just to make it easier to find out why boot fails.

Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
diff --git a/drivers/net/wireless/ath/ath6kl/debug.h b/drivers/net/wireless/ath/ath6kl/debug.h
index 7c34826..0fbb0ac 100644
--- a/drivers/net/wireless/ath/ath6kl/debug.h
+++ b/drivers/net/wireless/ath/ath6kl/debug.h
@@ -38,6 +38,7 @@
 	ATH6KL_DBG_AGGR		= BIT(15),    /* aggregation */
 	ATH6KL_DBG_SDIO		= BIT(16),
 	ATH6KL_DBG_SDIO_DUMP	= BIT(17),
+	ATH6KL_DBG_BOOT		= BIT(18),    /* driver init and fw boot */
 	ATH6KL_DBG_ANY	        = 0xffffffff  /* enable all logs */
 };