Add aconfig flag to control contextual tips frequency capping.

Bug: 322891421
Bug: 328338293
Test: unit tests
Flag: ACONFIG com.android.systemui.enable_contextual_tips_frequency_cap DEVELOPMENT
Change-Id: Ieebd45c4b6d8aa408d4f997718c46636b2186e19
diff --git a/packages/SystemUI/aconfig/systemui.aconfig b/packages/SystemUI/aconfig/systemui.aconfig
index 8c8975f..676a63c 100644
--- a/packages/SystemUI/aconfig/systemui.aconfig
+++ b/packages/SystemUI/aconfig/systemui.aconfig
@@ -454,6 +454,13 @@
 }
 
 flag {
+   name: "enable_contextual_tips_frequency_cap"
+   description: "Enables frequency capping for contextual tips, e.g. 1x/day, 2x/week, 3x/lifetime."
+   namespace: "systemui"
+   bug: "322891421"
+}
+
+flag {
    name: "enable_contextual_tips"
    description: "Enables showing contextual tips."
    namespace: "systemui"