Fix native permission helper local call handling

getCallingUid() will return own uid if we're not executing any incoming
transactions. Such calls should pass without any further checks.

Test: cts-tradefed run cts-dev -m DevicePolicyManager --test
com.android.cts.devicepolicy.ManagedProfileTest#testBluetooth
Bug: 69284968
Change-Id: Iebfc53a7243c78b1182889c2f2aaf3393e30b282