Fix more kotlin nullable errors in services.permission

Fix kotlin nullable errors that were exposed by setting the retention
of android.annotation.NonNull and android.annotation.Nullable to
class retention.

Bug: 294110802
Test: builds
Merged-In: Ib3358be57d7dd401fd2014ade3e58f9fc6c2b6a7
Change-Id: I74b2b7570adf025cf8ec3ea105eb06ea22c7d30e