Remove unnecessary dependency for Ravenizer

This will remove unnecessary rebuilds of tests when
framework-minus-apex.ravenwood and/or ravenwood-junit-impl changes.

Flag: EXEMPT host test change only
Bug: 391692157
Test: presubmit
Test: manual test:
    touch frameworks/base/ravenwood/texts/ravenwood-framework-policies.txt && m RavenwoodMinimumTest
    and make sure RavenwoodMinimumTest won't be rebuilt.
Change-Id: I803955510953956c5f19068adabbd17306255f2a