QS: Don't use ComponentName to identify tiles

Evidently some apps redirect/obscure tiles in a way that makes
creating a ComponentName from the TileService useless.  Instead
generate a token which will be a much more stable way of identifying
tiles henceforth.

Change-Id: Id68550bcdcdc3e3987f09380f258610e7a5aca85
Fixes: 29121793