[ADI][37/N] remove permission annotation for setDeveloperVerificationPolicy

Based on the API review feedback, the permission annotation is no longer
relevant. The implementation enforces that only the verifier and the
policy delegate can call this method. It doesn't perform and
permission check.

BUG: 429270004
FIXES: 429270004
BUG: 360129657
FLAG: android.content.pm.verification_service
Test: builds (just annotation change)

Change-Id: I261a6e572f91ed0a9ec8f8e7cbe303682a8eec48