binder_parcel_fuzzer: support owned Parcels

Some codepaths in Parcel are different when the Parcel
is owned. This allows fillRandomParcel to also sometimes
cause the returned Parcel be a view of a filled out
Parcel. This increases the possible impact and bug
finding abilities of all of our AIDL fuzzers as well.

Ignore-AOSP-First: fuzzing
Bug: 369404061
Test: binder_parcel_fuzzer
Change-Id: Ib19a0cbd74d48e18ba36cff56202541105ef9163