Replace ModuleContext.AConfig() with Config()

AConfig() now duplicates Config().  Replace the uses of AConfig()
with Config().  Leave AConfig() for now until code in other
projects is cleaned up.

Test: m checkbuild
Change-Id: Ic88be643049d21dba45dbd1a65588ed94bf43bdc
diff --git a/java/system_modules.go b/java/system_modules.go
index c3e40ca..5234d17 100644
--- a/java/system_modules.go
+++ b/java/system_modules.go
@@ -121,7 +121,7 @@
 
 	jars = append(jars, android.PathsForModuleSrc(ctx, system.properties.Jars)...)
 
-	if ctx.AConfig().TargetOpenJDK9() {
+	if ctx.Config().TargetOpenJDK9() {
 		system.outputFile = TransformJarsToSystemModules(ctx, "java.base", jars)
 	}
 }