Add sx126x_rx_boosted_gain to LoRA config

meshtastic/config.proto

@@ -725,6 +725,11 @@ message Config {
     */
     bool override_duty_cycle = 12; 
 
+    /*
+     * If true, sets RX boosted gain mode on SX126X based radios
+    */
+    bool sx126x_rx_boosted_gain = 13;
+
     /*
      * For testing it is useful sometimes to force a node to never listen to
      * particular other nodes (simulating radio out of range). All nodenums listed