Update git submodules

* Update platform/packages/services/Telephony from branch 'master'
  to b3291bb1f4771d86ff4954d365703a232eb177bb
  - Merge "Send Empty packet in MSRP"
  - Send Empty packet in MSRP
    
    Integrate cl/359552249 into AOSP test client
    
    Test: tx/rx message
    Change-Id: I50e89563bdb4a19e16307ab18333990c25529423
    
1 file changed