Reconstruct the hashsig hash tree(s) on device restart.

This can take long enough (several minutes for h=10) that we do it in a
background task, which is then converted to an RPC dispatch task.

Also add a very limited form of free(), to free the topmost allocation in
the sdram "heap". I don't want to deal with real heap management, but I do
want to be able to recover memory upon deleting a hashsig key, if it's
easy to do so.

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