irq_remap: Fix compiler warning with CONFIG_IRQ_REMAP=y

Fix the below compiler warning:

arch/x86/include/asm/irq_remapping.h:72:19: warning: ‘struct IO_APIC_route_entry’ declared inside parameter list [enabled by default]

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: joro@8bytes.org
Cc: iommu@lists.linux-foundation.org
Cc: Joerg Roedel <joerg.roedel@amd.com>
Link: http://lkml.kernel.org/r/1336460934-23592-1-git-send-email-suresh.b.siddha@intel.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>