MSIM: Rework statusbar, order signal clusters to match settings

Settings have SIM 1 on left, then SIM 2, etc. Do the same in the
statusbar. Also show the sim slot number in front of each signal
cluster.

Change-Id: I6ce16870af6374958b09a8a9d7d6d510f4561e13

Conflicts:
	packages/SystemUI/res/layout/msim_signal_cluster_view.xml
	packages/SystemUI/res/values/cm_strings.xml
	packages/SystemUI/res/values/styles.xml