Add bouncycastle src to the core_api_files list

Add bouncycastle src to the core_api_files list to enable
them to contribute to the core platform / intra-core APIs
in future commits.

Bug: 113148576
Test: build
Change-Id: I4ff97919640f7a9e527291bf704ce806174e28be
diff --git a/JavaLibrary.bp b/JavaLibrary.bp
index 4f3e278..9fdbf7f 100644
--- a/JavaLibrary.bp
+++ b/JavaLibrary.bp
@@ -82,6 +82,7 @@
 filegroup {
     name: "core_api_files",
     srcs: [
+        ":bouncycastle_java_files",
         ":core_oj_api_files",
         ":core_libart_api_files",
         ":core_simple_java_files",