Add logging for media notification seekbar

Also includes some minor fixes and improvements:
- Only update visibility of seekbar/scrubber if it changed
- Switching between seekable and not seekable media will update the
scrubber visibility
- Switching from seekbar to none will not restart the timer

Fixes: 132631846
Test: manual, atest com.android.systemui.statusbar.notification.row.wrapper.NotificationMediaTemplateViewWrapperTest
Change-Id: I158670119ad0742cf6a2387e08d54e548ee14ef5