Update git submodules

Update git submodules

* Update docs/submodules/sdc.git from branch 'elalto'
  to 09fb659de8b346fdb2b3a894b39319e445145f43
  - Update pom version

    Update pom version to 1.5.3 so that we can release a new Elalto

    Issue-ID: SDC-3162
    Signed-off-by: sebdet <sebastien.determe@intl.att.com>
    Change-Id: Ia337de253a921e6854eed61e078a7940ac8d6154

  - Update P12 certif

    Update P12 for El Alto maintenance release

    Issue-ID: SDC-3157
    Signed-off-by: sebdet <sebastien.determe@intl.att.com>
    Change-Id: I0151218c4fa0976174f38197716bc0bbc629a5ed