Revert "Expand @FlaggedApi(FLAG) constants in API signature files"

This reverts commit 35eb10d9dc5f7c99d50c87029a6fac3dc25e105b.

Reason for revert: Probable culprit for b/300626881

Change-Id: I5f1ca00ed83d4c41659bbdeb04c4ea296f08fa71
3 files changed