[PATCH] remove io_page_mask

[Jake Moilanen]

> I found an issue with the io_page_mask code when pci_probe_only is not
> set (we dont initialise io_page_mask and bad things happen). I was 
> about to fix it up when I wondered if we can remove it now.
> 
> Ben changed the serial code to check before it goes pounding on
> addresses. Im not sure if there were other issues with badly behaving
> drivers but my js20 boots here with the following removal patch.

As long as the serial code is fixed up, then the JS20 shouldn't need the
io_page_mask.  

Jake