Disable package visibility detector

Crashes with:
Error: Lint ran out of memory while building a callgraph (requested by these detectors: [PackageVisibilityDetector]). You can either disable these checks, or give lint more heap space. [LintError]

Test: Presubmits
Change-Id: Ia7ce4072af1c35295f21794f355b18a0c1a4d4b6