Pass public API list to class2greylist tool.

This is necessary to allow it to exclude synthetic bridge methods from the
generated greylist. We need to be able to apply the @UnsupportedAppUsage
annotation to regular (non-bridged) methods, but due to the SDK visibility
rules, the synthetic bridge is part of the SDK.

Bug: 110868826
Test: m
Change-Id: Iac23b0d2a9b371771a020b24191634a8b6b9b4b5