Remove aidl wrappers for framework parcelables

The new @JavaOnlyStableParcelable annotation allows using the framework
parcelables directly, which removes a lot of boilerplate.

Includes new copy constructors for IpPrefix and LinkAddress so they can
be copied easily as-is into parcelables.

Test: atest FrameworksNetTests
Test: booted, WiFi works
Bug: 126477266

Change-Id: Icac8afe498d0b5ebf9a0d0b9eceb14d64a29b381