Generate apex_available from c2a instead of a patch am: be4e5d71f3 am: ccbbe19eec am: c8c5a0525c

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/matches/+/1686945

Change-Id: Id8f7d8b5235d3077f1b929296f28c7479970dd6b