We now have two separate RSSI icons, one for wifi and one
for mobile data, as originally proposed in bug 5544770.
Each has an accompanying label showing the appropriate
network description string (PLMN or SSID or "No internet
connection"); these will be truncated as necessary to avoid
clobbering other UI elements in the panel.
Bug: 5543495
Bug: 5621224
Change-Id: I8fc322f8471fc94000e7230de359d3f1fe561b1e
5962fd5ec9