Quick Settings: Add visual indicator of ON/OFF Setting of Mobile Data tile

This addresses issue CYAN-221

Change-Id: I7dc0c8943df7a9478655bdde6745662c3831288f
SystemUI: Make the HSPA+ drawables more consistent with the HSPA drawables

Though the older HSPA+ drawables are sharper, that makes them look
out of place in comparison with the HSPA drawables.

Change-Id: I76313ae0125b3a8fda928b240f33715e48f77867