Make either available to product and vendor am: e0d0c6826e am: 06d38426db am: 030c450d36

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/either/+/2476307

Change-Id: I3a0c78aba68d7012ce1a06f978332ba4f8fa0905
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>