Make memchr available to product and vendor am: ae75378e8c am: ea6ce3a6c0 am: fe4070a3c5

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/memchr/+/2475775

Change-Id: I658a5f195be9f2ea3792d1a830fd022ec4cf2df5
Signed-off-by: Automerger Merge Worker <[email protected]>