abitidy: add functionality to remove top-level qualifiers on function parameter and return types am: 3888a5b0fd am: 9d46419b22 am: 84b53be3d1 am: d44213fc5d

Original change: https://android-review.googlesource.com/c/platform/external/libabigail/+/2162198

Change-Id: I8bb3301929079090f9dbcd994e066c49c9233d15
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>