Remove unstable IpPrefix

package android.net;

// @JavaOnlyStableParcelable only affects the parcelable when built as stable aidl (aidl_interface

// build rule). IpPrefix is also used in cpp but only as non-stable aidl.

@JavaOnlyStableParcelable parcelable IpPrefix cpp_header "binder/IpPrefix.h";

// build rule).

@JavaOnlyStableParcelable parcelable IpPrefix;