Kconfig: enlarge range of maximum number of IOMMU

Some arches have more than two IOMMUs, so change this limitation.

Tracked-On: #2435
Signed-off-by: Tw <wei.tan@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>

Author: tw4452852

hypervisor/arch/x86/Kconfig

@@ -93,7 +93,7 @@ config MAX_PT_IRQ_ENTRIES
 
 config MAX_IOMMU_NUM
 	int "Maximum number of IOMMU devices"
-	range 1 2
+	range 1 6
 	default 2
 	help
 	  The maximum number of physical IOMMUs the hypervisor can support.