Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 8189d6613964ac90995dfac73d33c05af695bd87
  - Merge "Release new image version"
  - Release new image version
    
    Change-Id: Idf3d95103507add6cd1011367ecb89290caf4690
    Issue-ID: USECASEUI-306
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
diff --git a/docs/submodules/usecase-ui.git b/docs/submodules/usecase-ui.git
index dae58c7..8189d66 160000
--- a/docs/submodules/usecase-ui.git
+++ b/docs/submodules/usecase-ui.git
@@ -1 +1 @@
-Subproject commit dae58c75b1e21aa437accdc4f748ea6e09e45907
+Subproject commit 8189d6613964ac90995dfac73d33c05af695bd87