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

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

Change-Id: Ic5a2b8f1f02e4de52a2c8cc23a1537d3216a9d16