Update git submodules

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>