[TASK] Add FileReference table mapping in extbase configuration

Extbase ships the FileReference model, but using it as a property
type causes a SQL error mentioning the table can not be found.

So adding the mapping to the extbase TypoScript configuration
resolves this problem.

Change-Id: I6d9452918dd78f767592aeafc9620e5ffc2880cc
Resolves: #44012
Releases: 6.0, 6.1
Reviewed-on: https://review.typo3.org/17160
Reviewed-by: Stefan Neufeind
Reviewed-by: Ingo Pfennigstorf
Reviewed-by: Helmut Hummel
Tested-by: Helmut Hummel