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>
    
1 file changed