Add PRODUCT_SHIPPING_API_LEVEL to device config

Bug: 175526482
Test: m selinux_policy
Change-Id: I040897f4bdb918aa4b1acb3539a7253640e670a3
diff --git a/android/variable.go b/android/variable.go
index e76d683..8b04d65 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -367,6 +367,8 @@
 	BoardMoveRecoveryResourcesToVendorBoot *bool `json:",omitempty"`
 
 	PrebuiltHiddenApiDir *string `json:",omitempty"`
+
+	ShippingApiLevel *string `json:",omitempty"`
 }
 
 func boolPtr(v bool) *bool {