hv_cpu_hotplug: CPU hotplug with all flags

Do cpu hotplug with all the default flags
Signed-off-by: NYu Wang <wyu@redhat.com>

qemu/tests/cfg/hv_cpu_hotplug.cfg

+- hv_cpu_hotplug:
+    type = cpu_device_hotpluggable
+    only Win2008, Win2012, Win2016, Win2019
+    Win2008, Win2012:
+        check_cpu_topology = no
+    no ovmf
+    cpu_model_flags += hv_crash
+    login_timeout = 360
+    sub_test_type = reboot
+    reboot_method = shell
+    vcpu_devices = vcpu1 vcpu2 vcpu3 vcpu4
+    hotpluggable_test = hotplug
+    vcpu_enable = no