components/bt: set the minimum encryption key size to be 7 octects for BR/EDR link...

This patch is to address the CVE-2019-9506 vulnerability.

diff --git a/components/bt/controller/lib b/components/bt/controller/lib
index 717f0c6ec71a016a0b292acffeacf239d007b8ff..9ee3b17ba9879ecee09070c5a543a57d8aff2036 160000 (submodule)
--- a/components/bt/controller/lib
+++ b/components/bt/controller/lib
@@ -1 +1 @@
-Subproject commit 717f0c6ec71a016a0b292acffeacf239d007b8ff
+Subproject commit 9ee3b17ba9879ecee09070c5a543a57d8aff2036