Import make variable NextReleaseHideFlaggedApi to Soong

This change imports NextReleaseHideFlaggedApi exported from soong_config

Test: m nothing
Bug: 299570421
Change-Id: I410596a39d2ba9ad353c5cf48bd38b1e843633b2
diff --git a/android/variable.go b/android/variable.go
index 6af0f18..44a8fd7 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -488,6 +488,8 @@
 	// PartitionVarsForBazelMigrationOnlyDoNotUse are extra variables that are used to define the
 	// partition images. They should not be read from soong modules.
 	PartitionVarsForBazelMigrationOnlyDoNotUse PartitionVariables `json:",omitempty"`
+
+	NextReleaseHideFlaggedApi *bool `json:",omitempty"`
 }
 
 type PartitionVariables struct {