Remove implementation details from permission hidden api flags

Ran the following to compute the set of split_packages and
package_prefixes properties.
    m analyze_bcpf && analyze_bcpf --bcpf com.android.permission-bootclasspath-fragment

Bug: 194063708
Test: m out/soong/hiddenapi/hiddenapi-flags.csv
Change-Id: I148891630da53d81ccdc6d3246a0b81e1e0fadc9