Forward port Quiet Hours settings

Change-Id: I4a7624a58421d8934eea89a9b7bde4539d3384db
revert to old data/signal null icons

Change-Id: Ia071717100c217b66c0498e174558b3c31f86b9b
Forward port Quiet Hours settings

Change-Id: I4a7624a58421d8934eea89a9b7bde4539d3384db