Make TestContext.RegisterModuleType take an android.ModuleFactory

Avoid having to pass ModuleFactoryAdaptor to every call to
RegisterModuleType in a test by wrapping RegisterModuleType.

Test: all soong tests
Change-Id: If8847d16487de0479cc3020b728256922b3cadba
diff --git a/android/package_test.go b/android/package_test.go
index e5b0556..ae286d6 100644
--- a/android/package_test.go
+++ b/android/package_test.go
@@ -87,7 +87,7 @@
 	config := TestArchConfig(buildDir, nil)
 
 	ctx := NewTestArchContext()
-	ctx.RegisterModuleType("package", ModuleFactoryAdaptor(PackageFactory))
+	ctx.RegisterModuleType("package", PackageFactory)
 	ctx.PreArchMutators(registerPackageRenamer)
 	ctx.Register()