libbinder: disable disabled tidy warnings

Before we disabled a clang tidy warning by reducing it to a warning.
This was invisible at the time, but now that clang is updated, it's
build log spam.

Fixes: 186144656
Test: build and no logs
Test: introduce a clang-tidy violation to make sure other checks are
    still enabled
Change-Id: I53a55949f809a9c05b3676c11e679ac3d98614eb