Include sdk versioning proto in permission apex

Allows SdkExtensions to inspect its version to decide what the extension
sdk version is on-device.

Bug: 188787081
Test: m com.android.permission and inspect
Change-Id: Icf8b31a77fca75dd6900e9f605a08153fa6e018f
diff --git a/Android.bp b/Android.bp
index da04257..2f24a1d 100644
--- a/Android.bp
+++ b/Android.bp
@@ -28,6 +28,7 @@
     min_sdk_version: "30",
     bootclasspath_fragments: ["com.android.permission-bootclasspath-fragment"],
     systemserverclasspath_fragments: ["com.android.permission-systemserverclasspath-fragment"],
+    prebuilts: ["current_sdkinfo"],
     key: "com.android.permission.key",
     certificate: ":com.android.permission.certificate",
     apps: ["PermissionController"],