ia64: remove the SGI UV simulator support

The simulator support was marked as temporary since the initial commit,
so drop it more than 10 years later.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lkml.kernel.org/r/20190813072514.23299-22-hch@lst.de


Signed-off-by: Tony Luck <tony.luck@intel.com>