Add activityInfo and getIcon() method in Tile class.

Moved loading icon logic from TileUtils into Tile#getIcon().

TileUtils only load things once and cache forever but getIcon()
loads a fresh icon every time to avoid any caching issue.

Bug: 77600770
Test: robotests
Change-Id: I706225e382ebd5b72e91edef43bfc7427fa64590