Delete some api_bp2build dead code.

Follow up of https://android-review.googlesource.com/2630914

Bug: 284029211
Test: presubmits
Change-Id: Idc0ff2f20e54b81cfdf61472a72e9cb027f60554
diff --git a/android/register.go b/android/register.go
index f1c2986..6182159 100644
--- a/android/register.go
+++ b/android/register.go
@@ -181,8 +181,7 @@
 	return ctx
 }
 
-// Helper function to register the module types used in bp2build and
-// api_bp2build.
+// Helper function to register the module types used in bp2build.
 func registerModuleTypes(ctx *Context) {
 	for _, t := range moduleTypes {
 		t.register(ctx)