[openthread] Update config

Removed DUA enabled to reach parity with nest team.
Removed backbone router enabled since fuchsia do not support multicast.
Added MLE link metrics subject enabled to support FTD 1.2 low power feature.

Thanks rongli@ for the suggestions!

Change-Id: I89e0a1e90c54c53244c0c904bb36a6fbfd4a404f
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/openthread/+/707562
Reviewed-by: Rongli Sun <rongli@google.com>
Reviewed-by: Robert Quattlebaum <rquattle@google.com>
diff --git a/include/openthread-config-fuchsia.h b/include/openthread-config-fuchsia.h
index 0925ef9..a21ebaf 100644
--- a/include/openthread-config-fuchsia.h
+++ b/include/openthread-config-fuchsia.h
@@ -66,9 +66,6 @@
 /* Define to 1 if you want to enable platform UDP. */
 #define OPENTHREAD_CONFIG_PLATFORM_UDP_ENABLE 1
 
-/* Define to 1 if you want to enable backbone router support */
-#define OPENTHREAD_CONFIG_BACKBONE_ROUTER_ENABLE 1
-
 /* Define to 1 if you want to enable TREL support */
 #define OPENTHREAD_CONFIG_RADIO_LINK_TREL_ENABLE 1
 
@@ -160,16 +157,6 @@
 #endif
 
 /**
- * @def OPENTHREAD_CONFIG_DUA_ENABLE
- *
- * When set, enables Domain Unicast Address on device.
- *
- */
-#ifndef OPENTHREAD_CONFIG_DUA_ENABLE
-#define OPENTHREAD_CONFIG_DUA_ENABLE 1
-#endif
-
-/**
  * @def OPENTHREAD_CONFIG_MLE_MAX_CHILDREN
  *
  * The maximum number of children.
@@ -185,4 +172,11 @@
  */
 #define OPENTHREAD_CONFIG_PLATFORM_RADIO_SPINEL_RX_FRAME_BUFFER_SIZE 24576
 
+/**
+ * @def OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE
+ *
+ * Mandatory for 1.2+ FTD for 1.2 low power feature
+ *
+ */
+#define OPENTHREAD_CONFIG_MLE_LINK_METRICS_SUBJECT_ENABLE 1
 #endif // THIRD_PARTY_OPENTHREAD_INCLUDE_OPENTHREAD_CONFIG_FUCHSIA_H_