Hide RSSI next to single carrier name

If there's exactly one SIM, do not show the RSSI next to the name in
QSBH. Instead, show it with the other icons. If there's more than one
SIM, show each RSSI next to the carrier name, and not with the other
icons (not even in QQS).

Test: atest com.android.systemui.qs
Test: manual single sim
Bug: 187654917
Bug: 194178072
Change-Id: I8b80bb14b8f60872d44d5a92ddfa7c5903420874
Merged-In: I8b80bb14b8f60872d44d5a92ddfa7c5903420874