Update git submodules

* Update docs/submodules/policy/apex-pdp.git from branch 'master'
  to f6da9a3bafb6f4c30e7bb3accd4e17fdaaf5ce92
  - Changes to fix PDP-A not going to ACTIVE state

    PDP-A state will now change to ACTIVE even when the policy list is
    empty.
    When the state is ACTIVE and PAP sends a PDP_UPDATE with policies, PDP-A
    will start executing the policies.

    Change-Id: Icb5b139939698920d4fa3991dcca33536c6caefc
    Issue-ID: POLICY-1674
    Signed-off-by: a.sreekumar <ajith.sreekumar@est.tech>

diff --git a/docs/submodules/policy/apex-pdp.git b/docs/submodules/policy/apex-pdp.git
index ca558cf..f6da9a3 160000 (submodule)
--- a/docs/submodules/policy/apex-pdp.git
+++ b/docs/submodules/policy/apex-pdp.git
@@ -1 +1 @@
-Subproject commit ca558cfb1ea47de081527771af47abb37a8cd964
+Subproject commit f6da9a3bafb6f4c30e7bb3accd4e17fdaaf5ce92