Fix bitflags/METADATA am: e68ed0e1a6 am: 506efc2ebd am: 515d292c67 am: ad6b96bfe6

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/bitflags/+/1414088

Change-Id: Ie6fe85055f02f5a819877bb3b7eba59d62ea88d6