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

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

Change-Id: Ib7c703327cf7808ef3c790aaab3dffd11bcb9203
Signed-off-by: Automerger Merge Worker <[email protected]>