Pass Config to NewTestContext instead of ctx.Register

Prepare for using Config when adding singletons by passing
Config to NewTestContext and NewContext instead of to ctx.Register.
This will enable a followup change to store SingletonMakeVarsProviders
registered on the Context in the Config, which is necessary to run
multiple tests in parallel without data races.

Test: all soong tests
Change-Id: Id229629a4e42ff4487d317241673837726c075fc
diff --git a/sysprop/sysprop_test.go b/sysprop/sysprop_test.go
index 7a79a1b..b8b93f6 100644
--- a/sysprop/sysprop_test.go
+++ b/sysprop/sysprop_test.go
@@ -57,7 +57,7 @@
 
 func testContext(config android.Config) *android.TestContext {
 
-	ctx := android.NewTestArchContext()
+	ctx := android.NewTestArchContext(config)
 	java.RegisterJavaBuildComponents(ctx)
 	java.RegisterAppBuildComponents(ctx)
 	java.RegisterSystemModulesBuildComponents(ctx)
@@ -76,7 +76,7 @@
 
 	ctx.RegisterModuleType("sysprop_library", syspropLibraryFactory)
 
-	ctx.Register(config)
+	ctx.Register()
 
 	return ctx
 }