Pass dt symbol argument for devices to crosvm

For crosvm to amend device tree for assigned devices, vendors provide
information about vm dtbo node.

Bug: 297313212
Test: vm run-microdroid and see crosvm argument
Change-Id: I52bc532361a40a0db6c1b6b0b25cc3ef29886f48
diff --git a/virtualizationservice/schema/current.txt b/virtualizationservice/schema/current.txt
index ed0763a..ef99294 100644
--- a/virtualizationservice/schema/current.txt
+++ b/virtualizationservice/schema/current.txt
@@ -3,8 +3,10 @@
 
   public class Device {
     ctor public Device();
+    method public String getDtbo_node();
     method public String getKind();
     method public String getSysfs_path();
+    method public void setDtbo_node(String);
     method public void setKind(String);
     method public void setSysfs_path(String);
   }