Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 7a7b81477be87698d847f9424fa58d4cdf64a143
  - feat:slicing business page basic functions code
    
    Change-Id: Ifae9e28151a746c1258e181c05154e86b3f89aee
    Issue-ID: USECASEUI-352
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
diff --git a/docs/submodules/usecase-ui.git b/docs/submodules/usecase-ui.git
index 60011b8..7a7b814 160000
--- a/docs/submodules/usecase-ui.git
+++ b/docs/submodules/usecase-ui.git
@@ -1 +1 @@
-Subproject commit 60011b80da470f37bd1512b3fbd05b8243ed42b6
+Subproject commit 7a7b81477be87698d847f9424fa58d4cdf64a143