Use Truth built from source. am: 108a0e1c1b am: 7199f7d6b2

Original change: https://android-review.googlesource.com/c/platform/external/exoplayer/+/2288473

Change-Id: Icc14880fe8769ecdb02ef6ff040435e004551198
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>