MSim Settings: Update UI/UX with user friendly strings

  Hide TuneAway and Priority subscription preferences unless
  config_HasTuneAway is set to true in device overlay.

  This conditionally reverts cea415df0cf19f9eb3dc1fef16d3a8955584c4f9
  as some device RILs don't support it.

Change-Id: I453f0833d80e17f7249d3b7c23fb2cc73ebd4c32
MSIM: Update icon for Multi Sim Settings category

Make it white like all the others

Change-Id: I7aed57b57e0151fcc5eb2418f67baf5e33b21658