framework-permission-s: Use correct min_sdk_version for S

Bug: 172453495
Test: m droid && launch_cvd
Change-Id: I69c196a765b159a87b352dfd09592322a51eb824
diff --git a/framework-s/Android.bp b/framework-s/Android.bp
index 22dce7e..7cce4a4 100644
--- a/framework-s/Android.bp
+++ b/framework-s/Android.bp
@@ -70,7 +70,7 @@
     lint: {
         strict_updatability_linting: true,
     },
-    min_sdk_version: "30",
+    min_sdk_version: "31",
     permitted_packages: [
         "android.permission",
         "android.app.role",