kernel: x86_64: drop CALGARY properly

Use correct config syntax of 'is not set' instead of just commenting the
line

Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>

target/linux/x86/64/config-4.19

@@ -75,8 +75,8 @@ CONFIG_NVME_MULTIPATH=y
 CONFIG_BLK_MQ_VIRTIO=y
 # CONFIG_BOOTPARAM_HOTPLUG_CPU0 is not set
 CONFIG_BTT=y
-# CONFIG_CALGARY_IOMMU=y
-# CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT=y
+# CONFIG_CALGARY_IOMMU is not set
+# CONFIG_CALGARY_IOMMU_ENABLED_BY_DEFAULT is not set
 CONFIG_CONNECTOR=y
 # CONFIG_CPU_HOTPLUG_STATE_CONTROL is not set
 CONFIG_CPU_RMAP=y