Do not revoke, just deny when policy says so

When the permission policy is set as PERMISSION_POLICY_AUTO_DENY, just
deny permission requests, do not revoke the permissions.

This is what the behavior used to be, so don't change it.

Test: atest --test-mapping src/com/android/packageinstaller/permission/service:postsubmit
      (This includes permission related CtsDevicePolicyManagerTestCases)

Change-Id: I9473adf7778cf48519e9d7255989d41dfee5501c