Revert "slim_ngd: Make sure transaction is not dereferenced after it's freed"

This reverts commit 4658dedbeb333cc660670e8e302b399f7c23a6bb.
Revert "binder: use freezable blocking calls"

This reverts commit 6ae7b0e1bbe7e1cd5fe91de72a6db243bfe9a422.