flags: Add leaudio_add_sampling_frequencies

Bug: 323287937
Bug: 315241296
Test: mmm packages/modules/Bluetooth
Tag: #feature
Change-Id: Id8e3e6f9cdd7a6cbbc80af46e2c9df307bf0b52a

flags/leaudio.aconfig

@@ -97,3 +97,10 @@ flag {
     description: "API to set device as inactive audio device upon connection"
     bug: "322387487"
 }
+
+flag {
+    name: "leaudio_add_sampling_frequencies"
+    namespace: "bluetooth"
+    description: "Adds missing frequencies defined by the Bluetooth SIG"
+    bug: "323287937"
+}