[SB][Notif] Use correct content descriptions for RON chips & call chips.

Bug: 364653005
Flag: com.android.systemui.status_bar_notification_chips

Test: Verify call chip content description is "{app name} notification:
Ongoing call. {time}"
Test: Verify notif chip content description is "{app name} notification:
Ongoing. {chip text}"
Test: Verify screen recording chip content description is "Screen
recording" (or "Screen casting" or "Screen sharing"), {time}"
Test: Verify all the above with chips_modernization flag OFF and ON

Change-Id: I0608dc680af24027c1f2947da550f98f2587423d