libbinder: Remove Parcel argument from Parcel::release_func

This enforces a clearer separation of concerns between the data owner
and the parcel code. It happened to reveal an edge case where FDs are
prematurely closed (tracking a fix in b/239222407).

Test: TH
Bug: 239222407
Change-Id: I54ff0c8e4a8f64afd529092d2038dac40c853371