Update git submodules

* Update docs/submodules/clamp.git from branch 'elalto'
  to 31fb8d0c57bd1fa8ff338dbc243b6906772ac51c
  - Remove bad url
    
    Remove bad url and useless files
    
    Issue-ID: CLAMP-642
    Change-Id: Iee749c83c061a81da01482e45c056e9d45ccd923
    Signed-off-by: sebdet <sebastien.determe@intl.att.com>
    
diff --git a/docs/submodules/clamp.git b/docs/submodules/clamp.git
index 21f688d..31fb8d0 160000
--- a/docs/submodules/clamp.git
+++ b/docs/submodules/clamp.git
@@ -1 +1 @@
-Subproject commit 21f688dfe427aa83c5520e6703fcf1461ac28821
+Subproject commit 31fb8d0c57bd1fa8ff338dbc243b6906772ac51c