Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 324c150c6bc6c81bfc35af23aa865cba2a1fccf4
  - docs: add the MDONS instance docs
    
    Change-Id: If772f775ad75e5681d0f18c318df08724c8e3e8e
    Issue-ID: USECASEUI-374
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
1 file changed