Make futures-channel available to product and vendor am: fa87efb692 am: 89f8da8c0a am: 0ac8726f5c am: 60b07a4b32

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/futures-channel/+/2475076

Change-Id: Icf5d8e25b1ba96c4ef52079753ee35c515a233a3
Signed-off-by: Automerger Merge Worker <[email protected]>