Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 9aa8ad1066895b11c66f8036f5d1aec9a836aa96
  - Merge "style: ptimize the upload part style of the onboard page"
  - style: ptimize the upload part style of the onboard page
    
    Change-Id: I7185d478cfef509c7802edd805116191d63ff24d
    Issue-ID: USECASEUI-307
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
diff --git a/docs/submodules/usecase-ui.git b/docs/submodules/usecase-ui.git
index d71fbd7..9aa8ad1 160000
--- a/docs/submodules/usecase-ui.git
+++ b/docs/submodules/usecase-ui.git
@@ -1 +1 @@
-Subproject commit d71fbd7859b58415d31e156c1eba8157ac5b5258
+Subproject commit 9aa8ad1066895b11c66f8036f5d1aec9a836aa96