Add Hearing Aid UI into Settings-Accessibility App

- add DIALOG_ACCESSIBILITY_HEARINGAID into metrics

Bug: 109948484
Test: build pass
Change-Id: Ib720cb3eeb47b57c48da68d8e3049b810357c527
diff --git a/proto/src/metrics_constants.proto b/proto/src/metrics_constants.proto
index 496cd96..02f0439 100644
--- a/proto/src/metrics_constants.proto
+++ b/proto/src/metrics_constants.proto
@@ -6175,6 +6175,11 @@
     // OS: Q
     FACE = 1511;
 
+    // OPEN: Settings > Acessibility > HearingAid pairing instructions dialog
+    // CATEGORY: SETTINGS
+    // OS: Q
+    DIALOG_ACCESSIBILITY_HEARINGAID = 1512;
+
 
     // ---- End Q Constants, all Q constants go above this line ----