bp2build: add support for soong_config_module_type.

Test: CI, go unit test
Bug: 198556411
Change-Id: Idf862904d51d822f92af0c072341c31b7a02fc64
diff --git a/android/config.go b/android/config.go
index 78d43c6..bc5ecc3 100644
--- a/android/config.go
+++ b/android/config.go
@@ -155,6 +155,7 @@
 	fs         pathtools.FileSystem
 	mockBpList string
 
+	runningAsBp2Build        bool
 	bp2buildPackageConfig    Bp2BuildConfig
 	bp2buildModuleTypeConfig map[string]bool