Generate apex_available from c2a instead of a patch am: 4f4e7e28e7 am: 2b7f7e3719 am: 67a59fb873

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/1689105

Change-Id: I43746a0ca05f30192955f377f68125ea8ea1bf35