Move most Ravenwood policies to annotations.

We've been splitting our definitions between `policies.txt` and
inline annotations; let's standardize on inline annotations.

This change is a mechanical no-op migration.

Bug: 324417456
Test: atest FrameworksCoreTestsRavenwood
Change-Id: I34c597f61874a57d783951215c2b0a61386ae6d5