Update git submodules

* Update docs/submodules/usecase-ui.git from branch 'master'
  to 8b1ee1f7fd52781df7af5e17c77521f39ae1d2ac
  - feat: optimize the code for the customer page
    
    Change-Id: Ic30e916f0531592194420f21cfd22b80152f0892
    Issue-ID: USECASEUI-307
    Signed-off-by: cyuamber <xuranyjy@chinamobile.com>
    
1 file changed