fix: fully-qualified enumerators for Java backend am: 2d833617bb

Original change: https://android-review.googlesource.com/c/platform/system/tools/aidl/+/1533042

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: Ibf1b2540614e3d1a77c10f272c41b1fcf9d66e17