Update git submodules

* Update docs/submodules/daisy from branch 'stable/euphrates'
  - Update doc content for Euphrates

    Change-Id: Ide23a73bd0f610bf949431538e64788c2dae0e12
    Signed-off-by: Zhijiang Hu <hu.zhijiang@zte.com.cn>
    (cherry picked from commit df803249f94c0858f9e9f5188bdd03ad9c26e3fb)

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index 9ae8c52..b55bdb9 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit 9ae8c5205831f1ccb3f379694ec170a077a61c79
+Subproject commit b55bdb9aa83c679f8ed9315d02ddf567370c6bb3