Update git submodules

* Update docs/submodules/clover from branch 'stable/gambia'
  - Clover Doc Patches: Update release note, user guide, and add Clovisor
    configuration guide

    Change-Id: I65da13cb9ce503f9b5b2fd2457f147549a13b9f6
    Signed-off-by: Stephen Wong <stephen.kf.wong@gmail.com>

diff --git a/docs/submodules/clover b/docs/submodules/clover
index 8ef9223..c932376 160000 (submodule)
--- a/docs/submodules/clover
+++ b/docs/submodules/clover
@@ -1 +1 @@
-Subproject commit 8ef9223828fd5c2c7df7e29a5965af8040ded377
+Subproject commit c93237636491fe052091c32e655d95adccd59c78