soong_config: Add flag for devices use metadata as FDE key

Change-Id: I5f70280e72613a8f850cb3263c45e95e80cb8b3c
Signed-off-by: Erfan Abdi <erfangplus@gmail.com>
diff --git a/build/soong/android/variable.go b/build/soong/android/variable.go
index 0569d20..d2f2e5b 100644
--- a/build/soong/android/variable.go
+++ b/build/soong/android/variable.go
@@ -6,9 +6,13 @@
 	TargetNeedsHWCOnFirstRef struct {
 		Cflags []string
 	}
+	Uses_metadata_as_fde_key struct {
+		Cflags []string
+	}
 }
 
 type ProductVariables struct {
 	Healthd_use_battery_info  *bool `json:",omitempty"`
 	TargetNeedsHWCOnFirstRef  *bool `json:",omitempty"`
+	Uses_metadata_as_fde_key  *bool `json:",omitempty"`
 }