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
f17f42b0df