Add persistent state for Bluetooth high quality audio support

Defines the flags used in code and the Settings.Global key names for
persisting the following state for Bluetooth A2DP Sink devices:
-Whether the device supports optional codecs or not
-Whether optional codecs should be turned on for the device

For each of these two properties we model the state in the code as
yes/no/unknown, so that we can tailor the UI and behavior
accordingly.

Bug=37441685
Test: manually

Change-Id: I6bcd02fd7c95bef989575f3b13d4788dab61971a
diff --git a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
index 885573e..c7c2222 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/SettingsProtoDumpUtil.java
@@ -696,6 +696,12 @@
                 Settings.Global.BLUETOOTH_A2DP_SRC_PRIORITY_PREFIX,
                 GlobalSettingsProto.BLUETOOTH_A2DP_SRC_PRIORITY_PREFIX);
         dumpSetting(s, p,
+                Settings.Global.BLUETOOTH_A2DP_SUPPORTS_OPTIONAL_CODECS_PREFIX,
+                GlobalSettingsProto.BLUETOOTH_A2DP_SUPPORTS_OPTIONAL_CODECS_PREFIX);
+        dumpSetting(s, p,
+                Settings.Global.BLUETOOTH_A2DP_OPTIONAL_CODECS_ENABLED_PREFIX,
+                GlobalSettingsProto.BLUETOOTH_A2DP_OPTIONAL_CODECS_ENABLED_PREFIX);
+        dumpSetting(s, p,
                 Settings.Global.BLUETOOTH_INPUT_DEVICE_PRIORITY_PREFIX,
                 GlobalSettingsProto.BLUETOOTH_INPUT_DEVICE_PRIORITY_PREFIX);
         dumpSetting(s, p,