libbinder_ndk: parcel_utils for SpAIBinder.

binder_parcel_utils.h was originally designed to be convenience
wrappers for C++ code, but the AIBinder object methods being added
there were using C types.

Bug: 111445392
Test: atest android.binder.cts

Change-Id: Ice812427104bbb41cc50d070f44dccfa02706ce8