Fix: ISliceManager.getPinnedSpecs::server blocked on the main thread during ufold

Bug: 322745650
Test: Manual test
Flag: NA

Change-Id: I3b765e92139f736a3c7dcb4acf776d62be5659fb
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 6f34f05..673a499 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -431,6 +431,16 @@
 }
 
 flag {
+    name: "slice_manager_binder_call_background"
+    namespace: "systemui"
+    description: "Move the ISliceManager#getPinnedSpecs binder call to the background thread."
+    bug: "322745650"
+    metadata {
+        purpose: PURPOSE_BUGFIX
+    }
+}
+
+flag {
    name: "register_new_wallet_card_in_background"
    namespace: "systemui"
    description: "Decide whether the call to registerNewWalletCards method should be issued on background thread."