[IA64] Normalize return value of chip->irq_set_affinity() method

[IA64] Normalize return value of chip->irq_set_affinity() method

On IA64 platforms, interrupt controller chip's irq_set_affinity() method
always copies affinity mask to irq_data->affinity field but still returns
0(IRQ_SET_MASK_OK). That return value causes the interrupt core logic
unnecessarily copies the mask to irq_data->affinity field again.
So return IRQ_SET_MASK_OK_NOCOPY instead of IRQ_SET_MASK_OK to get rid of
the duplicated copy operation.

Signed-off-by: Jiang Liu <jiang.liu@huawei.com>
Link: http://marc.info/?l=linux-ia64&m=133312092912438&w=2
Signed-off-by: Tony Luck <tony.luck@intel.com>