Make itoa available to product and vendor am: b3aca06ece am: 7921e779f6 am: ff1b83b00c

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/itoa/+/2475773

Change-Id: I86f64ade7af611d97ae3685f50c047f0b484691f
Signed-off-by: Automerger Merge Worker <[email protected]>