Remove android_prebuilt_sdk modules

Forcing sdk modules to be declared explicitly is unnecessary, just
add the required dependencies on the jar and aidl files.

Test: java_test.go
Change-Id: Ib28bdc1051c5825e7c0efb6adff1f9282675560e
diff --git a/java/app.go b/java/app.go
index e6b91a7..80d62fd 100644
--- a/java/app.go
+++ b/java/app.go
@@ -233,9 +233,7 @@
 
 	ctx.VisitDirectDeps(func(module blueprint.Module) {
 		var depFiles android.Paths
-		if sdkDep, ok := module.(sdkDependency); ok {
-			depFiles = sdkDep.ClasspathFiles()
-		} else if javaDep, ok := module.(Dependency); ok {
+		if javaDep, ok := module.(Dependency); ok {
 			if ctx.OtherModuleName(module) == "framework-res" {
 				depFiles = android.Paths{javaDep.(*AndroidApp).exportPackage}
 			}