Add framework-permission-s java_sdk_library.

This will host the moved framework classes for role.

The class RoleFrameworkPlaceholder is added because the build won't
pass if there isn't any java source.

Bug: 158736025
Test: build
Change-Id: Icabab2cc956d6c7c07a6217256d23a8402960307
diff --git a/framework/Android.bp b/framework/Android.bp
index 36b5dec..2150cb4 100644
--- a/framework/Android.bp
+++ b/framework/Android.bp
@@ -37,6 +37,7 @@
         "com.android.permission",
         "test_com.android.permission",
     ],
+    min_sdk_version: "30",
     permitted_packages: [
         "android.permission",
         "android.app.role",