[openthread] Enable radio coex capability

Change-Id: I29e2c87a2fc4ebe119485457bf39ad0f055916cb
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/openthread/+/588989
Reviewed-by: Robert Quattlebaum <rquattle@google.com>
diff --git a/include/openthread-config-fuchsia.h b/include/openthread-config-fuchsia.h
index 845d808..031d1f3 100644
--- a/include/openthread-config-fuchsia.h
+++ b/include/openthread-config-fuchsia.h
@@ -82,6 +82,9 @@
 /* The settings storage path on android. */
 #define OPENTHREAD_CONFIG_POSIX_SETTINGS_PATH "/data/thread"
 
+/* Enable radio coex capability */
+#define OPENTHREAD_CONFIG_PLATFORM_RADIO_COEX_ENABLE 1
+
 /**
  * @def OPENTHREAD_CONFIG_MAC_JOIN_BEACON_VERSION
  *