Update git submodules

* Update docs/submodules/daisy from branch 'master'
  - Merge "Add multicast spec"
  - Add multicast spec

    Change-Id: I3f9b9167864126b7b455761799dc79c40c394854
    Signed-off-by: Zhijiang Hu <hu.zhijiang@zte.com.cn>

diff --git a/docs/submodules/daisy b/docs/submodules/daisy
index 8f52576..d24bd81 160000 (submodule)
--- a/docs/submodules/daisy
+++ b/docs/submodules/daisy
@@ -1 +1 @@
-Subproject commit 8f52576ce2063e1e742e1e6fafd66f6979bb2d10
+Subproject commit d24bd81e5689c5d8531581fb8e3604d6851cc094