iommu: Add iommu probe for CDX bus

Add CDX bus to iommu_buses so that IOMMU probe is called
for it.
Signed-off-by: Nipun Gupta <nipun.gupta@amd.com>
Reviewed-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Nikhil Agarwal <nikhil.agarwal@amd.com>
Link: https://lore.kernel.org/r/20230313132636.31850-3-nipun.gupta@amd.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/iommu/iommu.c

@@ -28,6 +28,7 @@
 #include <linux/fsl/mc.h>
 #include <linux/module.h>
 #include <linux/cc_platform.h>
+#include <linux/cdx/cdx_bus.h>
 #include <trace/events/iommu.h>
 #include <linux/sched/mm.h>
 #include <linux/msi.h>
@@ -129,6 +130,9 @@ static struct bus_type * const iommu_buses[] = {
 #ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
 	&host1x_context_device_bus_type,
 #endif
+#ifdef CONFIG_CDX_BUS
+	&cdx_bus_type,
+#endif
 };
 
 /*