component/bt : use new lib, optimize BT power

diff --git a/components/bt/lib b/components/bt/lib
index 91657e0c4025f5a694b0a89f449c347b0f2fdf79..566acfd8c61a4ba0fb6b9026c89488b01af0fff0 160000 (submodule)
--- a/components/bt/lib
+++ b/components/bt/lib
@@ -1 +1 @@
-Subproject commit 91657e0c4025f5a694b0a89f449c347b0f2fdf79
+Subproject commit 566acfd8c61a4ba0fb6b9026c89488b01af0fff0