Update git submodules

* Update docs/submodules/clover from branch 'stable/gambia'
  - Docs Index

    Adds the missing index.rst needed to build the documentation.

    Change-Id: I6ff27873559718a5ca4e3120646a6ef347120c8a
    Signed-off-by: Trevor Bramwell <tbramwell@linuxfoundation.org>
    (cherry picked from commit 9a3972e792d50c17174d2c2c4f3df3d326405477)

diff --git a/docs/submodules/clover b/docs/submodules/clover
index c7ac596..d8208d0 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit c7ac596c0914b4f627e393d404707a9098e794f8
+Subproject commit d8208d08c823a2ffc29fa189bd2915cf94bb9c2d