Add wifi bootclasspath fragment to its sdk

This subsumes the java_sdk_library in the sdk.

Bug: 188427719
Test: build_mainline_modules.sh
Change-Id: I67c283069117ddce76ff86211eecd0b1b64a08eb
diff --git a/apex/Android.bp b/apex/Android.bp
index 207e543..499036a 100644
--- a/apex/Android.bp
+++ b/apex/Android.bp
@@ -66,9 +66,7 @@
 
 sdk {
     name: "wifi-module-sdk",
-    java_sdk_libs: [
-        "framework-wifi",
-    ],
+    bootclasspath_fragments: ["com.android.wifi-bootclasspath-fragment"],
 }
 
 // Encapsulate the contributions made by the com.android.wifi to the bootclasspath.