component/bt : update bt lib to fix flash operation bug

diff --git a/components/bt/lib b/components/bt/lib
index 566acfd8c61a4ba0fb6b9026c89488b01af0fff0..52639e93f42b426c5f3d29935f3f17fb1c6e2169 160000 (submodule)
--- a/components/bt/lib
+++ b/components/bt/lib
@@ -1 +1 @@
-Subproject commit 566acfd8c61a4ba0fb6b9026c89488b01af0fff0
+Subproject commit 52639e93f42b426c5f3d29935f3f17fb1c6e2169