Generate apex_available from c2a instead of a patch am: 01ff0c6d2e am: 0a44958a3e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/memoffset/+/1688983

Change-Id: I28163a194708e5e96c9d7163539984b160d5a9d4