Don't greylist public bridge methods.

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 sometimes part of the SDK. We need to know the public API set
in order to exclude these.

Bug: 110868826
Test: atest class2greylisttest
Test: m
Change-Id: I2ac9dfaaf60053762f379a5dc0d81e48a40a4e57