Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to c6f9f152bbed844843e4f2a137bcfa1b726dd81f
  - Ability to update PNF with new version of VSP
    
    Change-Id: Ie08d905bd40761b23198ad806be1750291343aae
    Issue-ID: SDC-2219
    Signed-off-by: kooper <sergey.sachkov@est.tech>
    
1 file changed