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/paths_test.go b/android/paths_test.go
index 2e67272..1d8afa9 100644
--- a/android/paths_test.go
+++ b/android/paths_test.go
@@ -865,9 +865,9 @@
 			config := TestConfig(buildDir, nil)
 			ctx := NewTestContext()
 
-			ctx.RegisterModuleType("test", ModuleFactoryAdaptor(pathForModuleSrcTestModuleFactory))
-			ctx.RegisterModuleType("output_file_provider", ModuleFactoryAdaptor(pathForModuleSrcOutputFileProviderModuleFactory))
-			ctx.RegisterModuleType("filegroup", ModuleFactoryAdaptor(FileGroupFactory))
+			ctx.RegisterModuleType("test", pathForModuleSrcTestModuleFactory)
+			ctx.RegisterModuleType("output_file_provider", pathForModuleSrcOutputFileProviderModuleFactory)
+			ctx.RegisterModuleType("filegroup", FileGroupFactory)
 
 			fgBp := `
 				filegroup {
@@ -1079,7 +1079,7 @@
 	ctx := NewTestContext()
 	ctx.SetAllowMissingDependencies(true)
 
-	ctx.RegisterModuleType("test", ModuleFactoryAdaptor(pathForModuleSrcTestModuleFactory))
+	ctx.RegisterModuleType("test", pathForModuleSrcTestModuleFactory)
 
 	bp := `
 		test {