Make error_prone_annotations anyapex-available

Bug: 199522401
Change-Id: I0edf82dbcf39364aa3463d00df7f23e71a110ca5
Test: Manually using ag/16005921.
diff --git a/Android.bp b/Android.bp
index 8b20933..4de3662 100644
--- a/Android.bp
+++ b/Android.bp
@@ -50,6 +50,10 @@
     name: "error_prone_annotations",
     host_supported: true,
     jars: ["error_prone/error_prone_annotations-2.8.1.jar"],
+    apex_available: [
+        "//apex_available:anyapex",
+        "//apex_available:platform",
+    ],
 }
 
 java_import {