Aconfig flag for the haptic brightness slider

Test: make
Bug: 296467915
Flag: ACONFIG com.android.systemui.haptic_brightness_slider DEVELOPMENT
Change-Id: Ia6f5eb4854f47483cfc5bb836fff4a1bc6264789
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 8eff9bf..c274911 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -59,3 +59,10 @@
         "HUN, bubble, pulse, or FSI."
     bug: "261728888"
 }
+
+flag {
+    name: "haptic_brightness_slider"
+    namespace: "systemui"
+    description: "Adds haptic feedback to the brightness slider."
+    bug: "296467915"
+}