Disconnect Heap Dump tile

The usefulness of this tile has been superseded by APC StatsD heap dumps, which automatically trigger on SysUI reaching a set watermark.

Moreover, due to permission changes, this is causing crashes and confusion among droidfooders.

Bug: 286719301
Test: Manually on cheetah
Change-Id: I0ced9fb829dca8880b3331c9285bd39b2d46ca80