component/bt: bugfix for hci acl flow control

1. trigger hci data transmission upon reception of hci_host_nb_of_cmpl_pkts when hci acl flow control is in effect

diff --git a/components/bt/lib b/components/bt/lib
index 4e3a5769d3c4eba23381a647dd781a32813e4335..caec3249986c4353a1e4ab91084706199763e9d3 160000 (submodule)
--- a/components/bt/lib
+++ b/components/bt/lib
@@ -1 +1 @@
-Subproject commit 4e3a5769d3c4eba23381a647dd781a32813e4335
+Subproject commit caec3249986c4353a1e4ab91084706199763e9d3