Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to 55c536e65dcbd1981de61c6c8bea318585324d22
  - Update SDC version 1.5.0
    
    Change-Id: I22d2273103230bd9ee7c3655b5f33e4308bb9f92
    Issue-ID: SDC-1913
    Signed-off-by: Sonsino, Ofir (os0695) <os0695@intl.att.com>
    
diff --git a/docs/submodules/sdc.git b/docs/submodules/sdc.git
index 14be881..55c536e 160000
--- a/docs/submodules/sdc.git
+++ b/docs/submodules/sdc.git
@@ -1 +1 @@
-Subproject commit 14be881ba45c3ce623131a9844155d8bdf140b5e
+Subproject commit 55c536e65dcbd1981de61c6c8bea318585324d22