Add com.android.virt

com.android.virt is an APEX for virtual machine monitors like crosvm.
The APEX currently empty and isn't updatable.

Bug: 174633082
Test: m com.android.virt

Change-Id: I1ff3cc29602fc7b8b2e7b0a117e03bb35b3402d8
diff --git a/apex/manifest.json b/apex/manifest.json
new file mode 100644
index 0000000..3330a67
--- /dev/null
+++ b/apex/manifest.json
@@ -0,0 +1,4 @@
+{
+  "name": "com.android.virt",
+  "version": 1
+}