Keystore 2.0: Switch to autogenerated AIDL bindings.

Remove pregenerated file android_security_keystore2.rs and
reconfigure the build to use the generated target
android.security.keystore2-rust instead.

Test: keystore2_test
Change-Id: Iad24cab05ef35ccc766f7342225d4b79e8051ada
2 files changed