Update git submodules

* Update docs/submodules/sdc/sdc-workflow-designer.git from branch 'master'
  to 8d870958cac0eaf35b5a99597bdcf8a9acfbd652
  - Bump version to 1.5.1
    
    Change-Id: I15f8ab906c3ae505cd3905234f6dfb05b58132a9
    Issue-ID: SDC-2560
    Signed-off-by: Ofir Sonsino <os0695@intl.att.com>
    
1 file changed