[IA64] swiotlb.c: long line, whitespace, and other cleanup

Clean up swiotlb.c a bit in preparation for some other changes that might be 
coming (e.g. moving it to the top level lib/ directory, adding support for 
more uses).  Mostly whitespace and long line fixes, along with a few printk 
fixes.
Signed-off-by: Jesse Barnes <jbarnes@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>