Update git submodules

* Update docs/submodules/so.git from branch 'master'
  to 312ee1ae732b0c904a25273b88322634d31ae0e6
  - Fixing SO build
    
    Change-Id: I99c0aee303c89fb5e25b51f616523e367a59785e
    Issue-ID: SO-2809
    Signed-off-by: waqas.ikram <waqas.ikram@est.tech>
    
1 file changed