Add sepolicy compat versions to soong config

Bug: 33691272
Test: build
Change-Id: If90f25540e8fd46e5c76e2a59015d46dd020c431
diff --git a/android/config.go b/android/config.go
index 0187a8a..afc138b 100644
--- a/android/config.go
+++ b/android/config.go
@@ -1469,6 +1469,10 @@
 	return String(c.config.productVariables.TotSepolicyVersion)
 }
 
+func (c *deviceConfig) PlatformSepolicyCompatVersions() []string {
+	return c.config.productVariables.PlatformSepolicyCompatVersions
+}
+
 func (c *deviceConfig) BoardSepolicyVers() string {
 	if ver := String(c.config.productVariables.BoardSepolicyVers); ver != "" {
 		return ver