Read assignable device list from vendor config xml

Bug: 297313212
Test: add /vendor/etc/avf/assignable_devices.xml and run vm info
Change-Id: I1e4a3991df930581a58da65830060c366fe58662
diff --git a/virtualizationservice/schema/removed.txt b/virtualizationservice/schema/removed.txt
new file mode 100644
index 0000000..d802177
--- /dev/null
+++ b/virtualizationservice/schema/removed.txt
@@ -0,0 +1 @@
+// Signature format: 2.0