Create a config flag for the new Screen Timeout settings screen

Test: compile
Bug: 368359967
Flag: com.android.settings.flags.catalyst_screen_timeout

Change-Id: I44f3898a0d003e1947d63985edf571c76b783f07

aconfig/catalyst/display.aconfig

@@ -7,3 +7,10 @@ flag {
   description: "Flag for Display"
   bug: "323791114"
 }
+
+flag {
+  name: "catalyst_screen_timeout"
+  namespace: "android_settings"
+  description: "Flag for Screen Timeout settings"
+  bug: "323791114"
+}