Use flutter-pi filesystem layout option (kirkstone)
Created by: ardera
Modifies the flutter-pi recipe:
- to configure flutter-pi using
-DFILESYSTEM_LAYOUT=meta-flutter
(lookup rules here) - no longer pin flutter-pi to a specific revision
- bc there's no longer a patch that can stop working when the flutter-pi is updated
- though if you pinned it for different reasons, we can also pin it to the current master commit instead
- (or set up some kind of roller, that opens PRs when flutter-pi updates, like flutter has)
- no longer apply the old path patch
- delete old path patch