Added ESP32-WROOM-DA module to boards.txt (#6361)

Added dual antenna configuration based on the module selection
Added warning to the example on how to use the DA

libraries/WiFi/src/WiFiGeneric.cpp

@@ -1061,6 +1061,14 @@ bool WiFiGenericClass::mode(wifi_mode_t m)
     if(!espWiFiStart()){
         return false;
     }
+
+    #ifdef BOARD_HAS_DUAL_ANTENNA
+        if(!setDualAntennaConfig(ANT1, ANT2, WIFI_RX_ANT_AUTO, WIFI_TX_ANT_AUTO)){
+            log_e("Dual Antenna Config failed!");
+            return false;
+        }
+    #endif
+
     return true;
 }