New case: Add iommu support for virtio input driver

Check virtio-input driver functions well with iommu_platform=on
Signed-off-by: NLi Jin <lijin@redhat.com>

qemu/tests/cfg/vioinput_keyboard.cfg

@@ -8,3 +8,13 @@
     inputs = input1
     input_dev_bus_type_input1 = virtio
     input_dev_type_input1 = keyboard
+    variants:
+        - @default:
+        - iommu_enabled:
+            only q35
+            no WinXP WinVista Win7 Win8 Win8.1 Win2000 Win2003
+            no Win2008..r2 Win2012 Win2012..r2
+            virtio_dev_iommu_platform = on
+            virtio_dev_ats = on
+            machine_type_extra_params = "kernel-irqchip=split"
+            extra_params = "-device intel-iommu,intremap=on,eim=on,device-iotlb=on"

qemu/tests/cfg/vioinput_mice.cfg

 - vioinput_mice:
+    only Windows
     required_qemu = [2.4.0, )
     no Win2008..sp2
     type = vioinput_mice
@@ -20,3 +21,13 @@
             mice_name = "QEMU Virtio Tablet"
             input_dev_type_input1 = tablet
             tolerance = 5
+    variants:
+        - @default:
+        - iommu_enabled:
+            only q35
+            no WinXP WinVista Win7 Win8 Win8.1 Win2000 Win2003
+            no Win2008..r2 Win2012 Win2012..r2
+            virtio_dev_iommu_platform = on
+            virtio_dev_ats = on
+            machine_type_extra_params = "kernel-irqchip=split"
+            extra_params = "-device intel-iommu,intremap=on,eim=on,device-iotlb=on"