Add carousel size info to dumpsys

Adds the media size, location, and state to dumpsys. This should help
debugging issues where the carousel doesn't display as expected.

Bug: 198319256
Test: manual - dumpsys activity service SystemUI, verify info
Test: atest QSPanelControllerBaseTest
Change-Id: I76a88d583bd0dbee4a65af20c628ca0bf69671b3