Update git submodules

Update git submodules

* Update docs/submodules/releng-xci from branch 'master'
  - Nomination of David Blaisonneau as XCI committer

    David Blaisonneau is the main driver of introducing native
    support for Pharos PDF/IDF in XCI. He has been also working
    on stabilizing XCI framework and enabling baremetal deployments.

    His contributions include
    - creation of PDFs for baremetal PODs
    - starting the work on improving the stabilization of the framework
    - starting the work on introducing support for PDF/IDF
    - deployment on baremetal

    Change-Id: If4e71c7456e5e8f642b3e82b8ef356747431ed96
    Signed-off-by: Fatih Degirmenci <fdegir@gmail.com>