Expose selinux variables to Soong.

Bug: 33691272
Test: manual
Change-Id: I4a568fb25a36331afb2ca51c3d8a676c3aba09e1
diff --git a/android/variable.go b/android/variable.go
index 2057903..ce2cb23 100644
--- a/android/variable.go
+++ b/android/variable.go
@@ -209,6 +209,11 @@
 
 	PgoAdditionalProfileDirs []string `json:",omitempty"`
 
+	BoardVendorSepolicyDirs     []string `json:",omitempty"`
+	BoardOdmSepolicyDirs        []string `json:",omitempty"`
+	BoardPlatPublicSepolicyDir  string   `json:",omitempty"`
+	BoardPlatPrivateSepolicyDir string   `json:",omitempty"`
+
 	VendorVars map[string]map[string]string `json:",omitempty"`
 }