Add Fast Pair saved devices settings page component name to config

The actual page is in GMSCore, which is not fully ready. I tested with
Nearby Share sharing page for indication.

Test: https://photos.app.goo.gl/E1T9hKtuci12SwuY7
Bug: 203579197
Change-Id: Idbbc4e6d5ca180a6d225b9410057473531bc2b0c