[IA64] use common header for software IO/TLB

Remove the swiotlb prototypes from the architecture code and use the
common header file instead.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>