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SystemUI: Redesign the scheme of selecting icons on signal cluster
1. Define icons arrays in res/values/arrays.xml, e.g. arrays for signal strength, data type, data activity, etc., so that these arrays are able to be overlayed. 2. Enhance TelephonyIcons.java, get the arrays defined in arrays.xml, and provide APIs to get icons. 3. Using new interface to get icons inside NetworkController and MSimNetworkController. CRs-Fixed: 627830 Change-Id: I5e735a43a7448a658dc621b24fffb29f56c133f9