fix error in using RadioLib with TGGO

firmware/main.ino

@@ -349,9 +349,11 @@ void setupLoRa()
   #endif
   #ifdef RL_SX1276
   pinMode(LORA_CS, OUTPUT);
-  pinMode(LORA2_CS, OUTPUT);
   digitalWrite(LORA_CS, LOW);
+  #ifdef DUAL_LORA
+  pinMode(LORA2_CS, OUTPUT);
   digitalWrite(LORA2_CS, HIGH);
+  #endif
   Layer1Class *Layer1_1 = new Layer1Class(&lora, 0, LORA_CS, LORA_RST, LORA_IRQ, 9, 915, 17);
   #ifdef DUAL_LORA
   digitalWrite(LORA_CS, HIGH);

firmware/platformio.ini

@@ -54,6 +54,14 @@ build_flags = -DTTGO_LORA_V2
               -DHAS_OLED
               -I./src
             ; -DLL2_DEBUG
+            ;
+[env:ttgo-lora32-v2-rl]
+board = ttgo-lora32-v1
+build_flags = -DTTGO_LORA_V2
+              -DRL_SX1276
+              -DHAS_OLED
+              -I./src
+            ; -DLL2_DEBUG
 
 [env:ttgo-lora32-tbeam]
 board = ttgo-lora32-v1