Update git submodules

* Update external/open-dice from branch 'master'
  to 7746483f34d04e45d45b9c7d0652609f6e3d7991
  - Add Cbor reader to rules.mk
    
    Include cbor reader source in the module so that it can be used by
    dependents.
    
    Test: build project
    
    Change-Id: I0d73da7b26e2f7fec329cdb3d5e34fa62b1e06db
    
1 file changed