Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 53b2cd5dfa6ac462e339f4fb00e9beceebc1c8f0
  - remove license issues
    
    Issue-ID: SO-2446
    
    Signed-off-by: seshukm <seshu.kumar.m@huawei.com>
    Change-Id: I00d93bf488f813d6bae1f254411960746dff0a34
    
diff --git a/docs/submodules/so.git b/docs/submodules/so.git
index 621dd5b..53b2cd5 160000
--- a/docs/submodules/so.git
+++ b/docs/submodules/so.git
@@ -1 +1 @@
-Subproject commit 621dd5b5b4f0e5058c86fe84926deb11e883b36c
+Subproject commit 53b2cd5dfa6ac462e339f4fb00e9beceebc1c8f0