Convert vintf_fragments into vintf_fragment module(s)

Convert vintf_fragments into vintf_fragment module(s) so those manifests
can be handled in the same way between KATI defined system image and
Soong defined system image.

Bug: 322089980
Test: aosp_cf_x86_64_phone build succeeded
Change-Id: Ie150676bde58d0723eab354e1eba03daabbe54c2
diff --git a/build/apex/Android.bp b/build/apex/Android.bp
index 4916df7..f794239 100644
--- a/build/apex/Android.bp
+++ b/build/apex/Android.bp
@@ -80,6 +80,11 @@
     }),
 }
 
+vintf_fragment {
+    name: "virtualizationservice.xml",
+    src: "virtualizationservice.xml",
+}
+
 apex_defaults {
     name: "com.android.virt_avf_enabled",
 
@@ -166,7 +171,7 @@
         true: "AndroidManifest.xml",
         default: unset,
     }),
-    vintf_fragments: select(soong_config_variable("ANDROID", "avf_remote_attestation_enabled"), {
+    vintf_fragment_modules: select(soong_config_variable("ANDROID", "avf_remote_attestation_enabled"), {
         "true": ["virtualizationservice.xml"],
         default: unset,
     }),