Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 52183bb7fed88d4dddaaa31e1114b8f77d7a5cc8
  - Add policy and data types to SDC
    
    - Define policy and data types for control loop
    - Onboard them as normative types in SDC
    
    Change-Id: I5188229ba91d5ddeabd43c4ac0b869abba7c42a0
    Issue-ID: SDC-2203
    Signed-off-by: Marco Platania <platania@research.att.com>
    
diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index 62f5ad6..52183bb 160000
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit 62f5ad6b806d0bda1bb918061a5aa4b5b4dbe8b8
+Subproject commit 52183bb7fed88d4dddaaa31e1114b8f77d7a5cc8