Binder: enable/fix some warnings am: 052c51302e

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/28154972

Change-Id: I6b6886a26686a7417b56700cb4e943bbc155db2d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>