dmar_tbl is declared as __initdata, but dmar_ir_support() is not declared
as an __init function.  Fix is simple since the only caller of dmar_ir_support
(intr_remapping_supported) is an __init function.
Signed-off-by: NTony Luck <tony.luck@intel.com>
Signed-off-by: NDavid Woodhouse <David.Woodhouse@intel.com>