Flag-guard vfio_handler policies

vfio_handler will be active only if device assignment feature is turned
on.

Bug: 306563735
Test: microdroid tests with and without the flag
Change-Id: I5559dfca1a29852b65481c95f37edc9977ee9d7d
diff --git a/flagging/Android.bp b/flagging/Android.bp
index babd034..b61b41d 100644
--- a/flagging/Android.bp
+++ b/flagging/Android.bp
@@ -16,14 +16,14 @@
 se_policy_conf_defaults {
     name: "se_policy_conf_flags_defaults",
     srcs: [":sepolicy_flagging_macros"],
-    flags: [],
+    flags: ["RELEASE_AVF_ENABLE_DEVICE_ASSIGNMENT"],
 }
 
 contexts_defaults {
     name: "contexts_flags_defaults",
     srcs: [":sepolicy_flagging_macros"],
     neverallow_files: [":sepolicy_flagging_macros"], // for seapp_contexts
-    flags: [],
+    flags: ["RELEASE_AVF_ENABLE_DEVICE_ASSIGNMENT"],
 }
 
 filegroup {