binder_parcel_fuzzer: reduce host/device differences

Before, the host code had certain cases disabled b/c ProcessState abrt
when /dev/binder is unavailable. However, it turns out in several
placess, ProcessState is still reachable (e.g. unflattenBinder). So,
instead, now, on host, the abort is just removed (and failures will
happen only when host tries to invoke binder later).

Bug: 142543448
Test: run binder_parcel_fuzzer for a few minutes
Change-Id: I0a322d3191be3aee630f735986064d502016c05d