Add the DynamicAndroid Service

  Define the DynamicAndroid with AIDL.
  Add a java implementation.
  Start a service instance in the system server.
  Add a permission test.

Bug: 122015653
Test: Build & Test on a pixel phone with following command \
  ./frameworks/base/services/tests/runtests.py -e class com.android.server.DynamicAndroidTest

Merged-In: I2e54b6b71fac4a4c5a9c9c25ce6bdac74cddcfb7
Change-Id: I2e54b6b71fac4a4c5a9c9c25ce6bdac74cddcfb7