bp2build: add support for soong_config_module_type.

Test: CI, go unit test
Bug: 198556411
Change-Id: Idf862904d51d822f92af0c072341c31b7a02fc64
diff --git a/android/register.go b/android/register.go
index 5984862..4244398 100644
--- a/android/register.go
+++ b/android/register.go
@@ -161,6 +161,10 @@
 	return ctx
 }
 
+func (ctx *Context) SetRunningAsBp2build() {
+	ctx.config.runningAsBp2Build = true
+}
+
 // RegisterForBazelConversion registers an alternate shadow pipeline of
 // singletons, module types and mutators to register for converting Blueprint
 // files to semantically equivalent BUILD files.