Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to b9575f3c49144853f188c7b20fa167b40d873aff
  - Merge "docs: add release note and changelog"
  - docs: add release note and changelog
    
    Change-Id: I68e59fc2a008a77514e97598e077a01a26371a5a
    Issue-ID: USECASEUI-307
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
1 file changed