Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to efec7c5f7abb24da6d8ab93a71ee725e1c1f438f
  - UnifiedCompositionService - Refactor code to handle Optional value
    
    Issue-ID: SDC-3015
    Signed-off-by: Chris Andre <chris.andre@yoppworks.com>
    Change-Id: I1d15d20e9c603ff894c7c4be46b26d60745cb7e5
    
diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index 45d6bf5..efec7c5 160000
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit 45d6bf5520f9c70e57e473b109870b8ad0eb7251
+Subproject commit efec7c5f7abb24da6d8ab93a71ee725e1c1f438f