Sync displayName and other fields across grouped subscriptions.

1) Defined which properties needs synced within a subscription group in
GROUP_SHARING_PROPERTIES.

2) Rename databaseUpdateHelper to updateDatabase.

3) In syncGroupedSetting, get all values of properties in
GROUP_SHARING_PROPERTIES and copy to all subscriptions in the group.

Bug: 134695820
Test: manual
Change-Id: I711e45273be93fadf6bfe1e174f369d731c33510
Merged-In: I711e45273be93fadf6bfe1e174f369d731c33510