Add microfuchsia apex that runs in AVF on bootup

This requires another apex com.android.microfuchsia.images to be present
that contains a /etc/fuchsia.zbi and /etc/linux-arm64-boot-shim.bin.

Test: Boot up and use console with:
  adb shell -t /apex/com.android.virt/bin/vm console
Bug: b/348687281, b/348434277, b/348433755
Change-Id: I3fe0674d793d37763011f102982f5c3e56b57b5e
diff --git a/microfuchsia/apex/manifest.json b/microfuchsia/apex/manifest.json
new file mode 100644
index 0000000..b7ea23b
--- /dev/null
+++ b/microfuchsia/apex/manifest.json
@@ -0,0 +1,4 @@
+{
+  "name": "com.android.microfuchsia",
+  "version": 1
+}