libbinder_rs: Use NDK parcelable array APIs

Rather than embedding the wire format of parcelable arrays in rust, we
should rely on the NDK implementation to parcel and unparcel arrays of
generic parcelables. This allows the NDK to change the wire protocol
independently of the Rust library.

Test: atest -p frameworks/native/libs/binder/TEST_MAPPING
Bug: 174801709
Change-Id: I52dd35c506e96840f8e765ba53cb7c83f4921536