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 <[e-mail]>
Reviewed-by: Pieter Jansen van Vuuren <[e-mail]>
Reviewed-by: Lu Baolu <[e-mail]>
Tested-by: Nikhil Agarwal <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/iommu/iommu.c

···
 #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>
···
 #endif
 #ifdef CONFIG_TEGRA_HOST1X_CONTEXT_BUS
 	&host1x_context_device_bus_type,
+#endif
+#ifdef CONFIG_CDX_BUS
+	&cdx_bus_type,
 #endif
 };