Added buttons for entering and exiting customize mode

+ added buttons for adding shortcut.

Fix: 373632868
Fix: 373619545
Test: Manual - ensure UI corresponds with UI mocks.
Flag: com.android.systemui.keyboard_shortcut_helper_shortcut_customizer
Change-Id: Ia8a695049cbc2dfc2a638f31d06b2708aef20313
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index d124c02..d50a92b 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -1667,3 +1667,12 @@
   description: "Expands the shade on long press of any status bar"
   bug: "371224114"
 }
+
+
+flag {
+    name: "keyboard_shortcut_helper_shortcut_customizer"
+    namespace: "systemui"
+    description: "An implementation of shortcut customizations through shortcut helper."
+    bug: "365064144"
+}
+