floss: Add Device Information Service

Update sysprops to have device information and register DIS during
startup via floss. This will eventually move out of Floss and into
libbluetooth in the future.

Bug: 277818879
Tag: #floss
Test: Gatt connect two chromebooks and observer PNP_ID is valid
Change-Id: I5ac03258ad5ecb00ec5620fb6e6609be87ea97f2