Revert "Make outout of cppbor::parse safely mutable" am: c0145278ff

Original change: https://android-review.googlesource.com/c/platform/system/libcppbor/+/2470990

Change-Id: Ia3b61ecf0e75ccb801fa264f9bb8ff5cd6f01320
Signed-off-by: Automerger Merge Worker <[email protected]>