Generate apex_available from c2a instead of a patch am: 01ff0c6d2e am: 0a44958a3e am: ab3823c0e4

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

Change-Id: Ic9fc94c8593a98f90982853628638cb634ed4a6b