win_virtio_driver_update_test.cfg: add two cases for pvpanic

add install/uninstall and upgrade/downgrade driver cases for pvpanic
Signed-off-by: NYu Wang <wyu@redhat.com>

qemu/tests/cfg/win_virtio_driver_update_test.cfg

@@ -131,3 +131,15 @@
             during_bg_test:
                 read_rng_cmd = for /l %i in (1, 1, 1000) do "WIN_UTILS:\random_%PROCESSOR_ARCHITECTURE%.exe"
                 driver_check_cmd = ""
+        - with_pvpanic:
+            only before_bg_test
+            no Host_RHEL.m6
+            driver_name = pvpanic
+            device_name = "QEMU PVPanic Device"
+            run_bgstress = pvpanic
+            event_check = "GUEST_PANICKED"
+            crash_method = nmi
+            timeout = 360
+            backup_image_before_testing = yes
+            restore_image_after_testing = yes
+            set_panic_cmd = 'wmic class stdregprov call SetDwordValue hDefKey="&h80000002" sSubKeyName="SYSTEM\CurrentControlSet\Control\CrashControl" sValueName="NMICrashDump" uValue=1'