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>
    
1 file changed