rear-camera: Correctly describe needed reglators

Looking at https://source.puri.sm/Librem5/linux-next/-/merge_requests/412 i noticerd the current DTS for the rear camera only has a single supply wired up while looking at the data sheet I see at least VDDD, VDDA, VDDIO. Having these correct is necessary for correct regulator powerup/powerdown order.