Convert bootanimation to Android.bp

See build/soong/README.md for more information.

Test: cd frameworks/base/cmds/bootanimation; mma
Change-Id: I7e023ffc42f61ce9a215a958fbbd158a6a8352d7
Merged-In: I7e023ffc42f61ce9a215a958fbbd158a6a8352d7
(cherry picked from commit efc3e37c)