fix: T18 has no power switch on AUX2 (#4035)

Author: raphaelcoeffic

radio/src/targets/horus/hal.h

@@ -498,8 +498,10 @@
   #define AUX2_SERIAL_DMA_Stream_RX            DMA2_Stream1 // or DMA2_Stream2
   #define AUX2_SERIAL_DMA_Channel_RX           LL_DMA_CHANNEL_5
   #define AUX2_SERIAL_DMA_Stream_RX_LL         LL_DMA_STREAM_1
-  #define AUX2_SERIAL_PWR_GPIO                 GPIOB
-  #define AUX2_SERIAL_PWR_GPIO_PIN             GPIO_Pin_0  // PB.00
+  #if !defined(RADIO_T18)
+    #define AUX2_SERIAL_PWR_GPIO               GPIOB
+    #define AUX2_SERIAL_PWR_GPIO_PIN           GPIO_Pin_0  // PB.00
+  #endif
 #endif
 #else // AUX2_SERIAL
   #define AUX2_SERIAL_RCC_AHB1Periph           0