[IA64] one-line cleanup on set_irq_affinity_info

Calls to set_irq_info in set_irq_affinity_info() is redundant because
irq_affinity mask was set just one line immediately above it.  Remove
that duplicate call.

Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>