config tool: change vm_type to required field

hide vm_type in UI for service vm, and change it to
required field, since lack of it in xml may lead to
wrong inference for vm severity.

Tracked-On: #6690
Signed-off-by: hangliu1 <hang1.liu@linux.intel.com>

misc/config_tools/data/qemu/shared.xml

@@ -59,6 +59,7 @@
   </hv>
   <vm id="0">
     <load_order>SERVICE_VM</load_order>
+    <vm_type>STANDARD_VM</vm_type>
     <name>ACRN_Service_VM</name>
     <os_config>
       <kern_type>KERNEL_BZIMAGE</kern_type>
@@ -80,4 +81,4 @@
     </cpu_affinity>
     <console_vuart>None</console_vuart>
   </vm>
-</acrn-config>
+</acrn-config>