iommu/vt-d: Add missing "__init" for rmrr_sanity_check()

rmrr_sanity_check() calls arch_rmrr_sanity_check(), which is marked as
"__init". Add the annotation for rmrr_sanity_check() too. This function is
currently only called from dmar_parse_one_rmrr() which is also "__init".
Signed-off-by: Marco Bonelli <marco@mebeim.net>
Link: https://lore.kernel.org/r/20220210023141.9208-1-marco@mebeim.netSigned-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20220301020159.633356-11-baolu.lu@linux.intel.comSigned-off-by: Joerg Roedel <jroedel@suse.de>

drivers/iommu/intel/iommu.c

@@ -3364,7 +3364,7 @@ static void __init init_iommu_pm_ops(void)
 static inline void init_iommu_pm_ops(void) {}
 #endif	/* CONFIG_PM */
 
-static int rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr)
+static int __init rmrr_sanity_check(struct acpi_dmar_reserved_memory *rmrr)
 {
 	if (!IS_ALIGNED(rmrr->base_address, PAGE_SIZE) ||
 	    !IS_ALIGNED(rmrr->end_address + 1, PAGE_SIZE) ||