Add legacy ModesTile

Even though the main focus is to get the new architecture tile working,
this tile shouldn't depend on the qs_new_tiles release, so we still need
a legacy style tile until the transition is complete.

Bug: 346519570
Test: checked that the tile works when qs_new_tiles is off
Flag: android.app.modes_ui

Change-Id: Ibedd556fdb38130eb71ca818aa32498b6b82f682