Make outout of cppbor::parse safely mutable am: 1a288db757

Original change: https://android-review.googlesource.com/c/platform/system/libcppbor/+/2468182

Change-Id: Ie63642db6c362c1af7d493533ef2b339bd939168
Signed-off-by: Automerger Merge Worker <[email protected]>