Merge changes from topic "expose_flagged_api_revert" into main

* changes:
  Revert^2 "Add flagged api hide conditional to droidstubs"
  Revert^2 "Add soong config variable Release_expose_flagged_api"

android/variable.go

@@ -490,6 +490,8 @@ type ProductVariables struct {
 	PartitionVarsForBazelMigrationOnlyDoNotUse PartitionVariables `json:",omitempty"`
 
 	NextReleaseHideFlaggedApi *bool `json:",omitempty"`
+
+	Release_expose_flagged_api *bool `json:",omitempty"`
 }
 
 type PartitionVariables struct {