Add WithDexpreopt soong variable

Test: m selinux_policy on sc-arc
Change-Id: I9e8ba5746e4648a04fe4d8fbe5d3403ba06b5914
diff --git a/android/variable.go b/android/variable.go
index 776a5c7..2ab51c7 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -341,6 +341,8 @@
 
 	DexpreoptGlobalConfig *string `json:",omitempty"`
 
+	WithDexpreopt bool `json:",omitempty"`
+
 	ManifestPackageNameOverrides []string `json:",omitempty"`
 	CertificateOverrides         []string `json:",omitempty"`
 	PackageNameOverrides         []string `json:",omitempty"`