Revert "Revert "Make outout of cppbor::parse safely mutable"" am: 1398a70364 am: 5a54201c94 am: e95b86d4c7 am: 7a4786c7d2

Original change: https://android-review.googlesource.com/c/platform/system/libcppbor/+/2474924

Change-Id: Ie9ce64835b83b87fee5661e8af60c19d35a31b13
Signed-off-by: Automerger Merge Worker <[email protected]>