Implement the JNI layer for the AVRCP Service (1/3)

Add the JNI interface for the AVRCP Target Service and the Java class
that controls it.

Bug: 68854188
Test: Compile
Change-Id: Id368ea817439763eb2d0edd581a84ce32515b1f2
(cherry picked from commit d8806e81c6aedce36125db5d682a06adcfab24f9)
Merged-In: Id368ea817439763eb2d0edd581a84ce32515b1f2
4 files changed