drivefs: Bump flag expiry to M119

We are enabling this feature TOT in M115, lets bump the expiry to M119.

Bug: b:201774934
Change-Id: I853f92e1767e889dc85ee89185a73b941a38abda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4554896


Auto-Submit: Travis Lane <travislane@google.com>
Commit-Queue: Ben Reich <benreich@chromium.org>
Reviewed-by: Ben Reich <benreich@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1147665}