Update git submodules

* Update docs/submodules/policy/apex-pdp.git from branch 'master'
  to c4baac8a79b0ca6340693ae47f9c424f3612e3bd
  - Merge "Remove topic.properties and incorporate into overall properties"
  - Remove topic.properties and incorporate into overall properties

    1) The properties in the topic.properties file is moved into overall
    config json file and the topic.properties file is removed.
    2) Common parameters such as RestServer and Topic related parameters
    from policy-common is used.

    Change-Id: Ifc25185c8f717c95a226b2db25c1a8e96b9bbff9
    Issue-ID: POLICY-1744
    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 423e986..c4baac8 160000 (submodule)
--- a/docs/submodules/policy/apex-pdp.git
+++ b/docs/submodules/policy/apex-pdp.git
@@ -1 +1 @@
-Subproject commit 423e98641ca7fe79a1b1bb897aa8a4b17ba5ee4d
+Subproject commit c4baac8a79b0ca6340693ae47f9c424f3612e3bd