[QPG] Fix for OpenThread Stack bump compile issue

Author: dvdm-qorvo

third_party/openthread/platforms/qpg/BUILD.gn

@@ -32,6 +32,18 @@ config("openthread_qpg_config") {
     "QORVO_FTD=${chip_openthread_ftd}",
     "QORVO_RCP=0",
   ]
+
+  if (chip_openthread_ftd) {
+    defines += [
+      "OPENTHREAD_FTD=1",
+      "OPENTHREAD_MTD=0",
+    ]
+  } else {
+    defines += [
+      "OPENTHREAD_FTD=0",
+      "OPENTHREAD_MTD=1",
+    ]
+  }
 }
 
 source_set("openthread_core_config_qpg") {