Modify vm_config.json properly

Bug: 373248801
Bug: 374244795
Test: will be tested in kokoro
Change-Id: Ie21c2000a0d9ba4707a029ebeedecf1075a0c46f
diff --git a/build/debian/vm_config.json.x86_64 b/build/debian/vm_config.json.x86_64
index c9a16bf..2fb9faa 100644
--- a/build/debian/vm_config.json.x86_64
+++ b/build/debian/vm_config.json.x86_64
@@ -7,6 +7,9 @@
             "writable": true
         }
     ],
+    "kernel": "$PAYLOAD_DIR/vmlinuz",
+    "initrd": "$PAYLOAD_DIR/initrd.img",
+    "params": "root=/dev/vda1",
     "protected": false,
     "cpu_topology": "match_host",
     "platform_version": "~1.0",
@@ -17,4 +20,3 @@
     "console_input_device": "ttyS0",
     "network": true
 }
-