Update git submodules

* Update docs/submodules/msb/discovery.git from branch 'master'
  to c2d204d0c00f043c20a8272f8ab167976ad4d581
  - update version to 1.2.6-SNAPSHOT
    
    Issue-ID: MSB-463
    Signed-off-by: Huabing Zhao <zhao.huabing@zte.com.cn>
    Change-Id: Id1662e36028a8b5c79dc26ecdaa67d8026d4b62c
    
1 file changed