Add com.android.virt-bootclasspath-fragment

Bug: 243512044
Test: build on product with AVF support
Test: build on product without AVF support
Change-Id: Iefebdad4da18bab5870c41f67839030d927ab6f7

boot/Android.bp

@@ -120,6 +120,10 @@ platform_bootclasspath {
             apex: "com.android.car.framework",
             module: "com.android.car.framework-bootclasspath-fragment",
         },
+        {
+            apex: "com.android.virt",
+            module: "com.android.virt-bootclasspath-fragment",
+        },
     ],
 
     // Additional information needed by hidden api processing.