Update git submodules

* Update docs/submodules/sdc.git from branch 'master'
  to a7e2351ac2700bc62584d8f16057c1efa1f64400
  - Improve log texts
    
    Issue-ID: SDC-2852
    Signed-off-by: Lasse Kaihlavirta <l.kaihlavirt@partner.samsung.com>
    Change-Id: I7a1ebfc625e297f943794046f37b15cc48d8cacb
    
1 file changed