Package whitelist for hiddenapi checks.

Package whitelist for hiddenapi checks.

Some packages in the system image are not built against the SDK, so
enforcing hiddenapi checks for these will break them. Add a whitelist
for such packages.

For now, just add the contacts provider to the whitelist. The list will be
further populated later.

Test: Added test app package name to whitelist to verify.

Bug: 73244707
Change-Id: I94746b7f12dd9371d5068bb235eb853f63ee4d97