Move art related hidden API flag files to art

Bug: 179354495
Test: verified that the out/soong/hiddenapi/... files are unchanged
      by this change
Change-Id: Ie5184cfdb4da9c03d804a6022a8981732c3137ba
diff --git a/boot/Android.bp b/boot/Android.bp
index 844dd64..0fc455b 100644
--- a/boot/Android.bp
+++ b/boot/Android.bp
@@ -44,6 +44,15 @@
 platform_bootclasspath {
     name: "platform-bootclasspath",
 
+    // The bootclasspath_fragments that contribute to the platform
+    // bootclasspath.
+    fragments: [
+        {
+            apex: "com.android.art",
+            module: "art-bootclasspath-fragment",
+        },
+    ],
+
     // Additional information needed by hidden api processing.
     hidden_api: {
         unsupported: [
@@ -64,9 +73,6 @@
         max_target_o_low_priority: [
             "hiddenapi/hiddenapi-max-target-o.txt",
         ],
-        blocked: [
-            "hiddenapi/hiddenapi-force-blocked.txt",
-        ],
         unsupported_packages: [
             "hiddenapi/hiddenapi-unsupported-packages.txt",
         ],