DO NOT MERGE: Add constant for Output Switcher to start Bluetooth paring page

Bug: 155822415
Test: build pass
Merged-In: Iaaf7aadf8dc371881fc831e91ff6e62be49b0219
Change-Id: Iaaf7aadf8dc371881fc831e91ff6e62be49b0219
(cherry picked from commit 298b575cc6318882bfecc1947610a70b761a9cf9)
diff --git a/core/proto/android/app/settings_enums.proto b/core/proto/android/app/settings_enums.proto
index 2cfd6105..8cccea8 100644
--- a/core/proto/android/app/settings_enums.proto
+++ b/core/proto/android/app/settings_enums.proto
@@ -2688,4 +2688,7 @@
     // CATEGORY: SETTINGS
     // OS: R QPR
     ADAPTIVE_CONNECTIVITY_CATEGORY = 1850;
+
+    // OS: R QPR2
+    BLUETOOTH_PAIRING_RECEIVER = 1851;
 }