Merge branch 'bugfix/btdm_connect_stable_optimiz' into 'master'

component/bt: Optimiz the ble connection performance.



See merge request !1618

components/bt/lib

@@ -1 +1 @@
-Subproject commit 856881b2768204ce2bf3584724324dddc8378f11
+Subproject commit 4b4ff28683982cee0b89e1e7a4480c2abfb00f0c