Switch SL4N over to using Android.bp (3/3)

Due to the move to using mostly header libs for the AVRCP changes SL4N
couldn't find references to certain files without having to include a
large number of include directorys. Swapping the Makefile to Android.bp
makes this much easier to handle.

Bug: 68854188
Test: Compile and see that the application exists where it should
Change-Id: I3cd623bfee4a2cbf95f4bcc212ccd7e9fc980242
(cherry picked from commit 0ed69e07ef9e23ad9a199460ff0cba4b1410d0b2)
Merged-In: I3cd623bfee4a2cbf95f4bcc212ccd7e9fc980242
2 files changed
tree: c9bc875234c5ed1940ea835ed8a48319aa4c05d3
  2. PMC/
  3. PREUPLOAD.cfg
  4. UID/
  5. sl4n/