fix: QX7 PCBREV detection (#3922)

Summary of changes:
- PCBREV detection for X7 was disabled as part of early 2.10 work
- It leads to SPORT port not been available on X7
- Once enable, option is back, tested flashing a receiver ok

radio/src/targets/taranis/hal.h

@@ -2150,15 +2150,15 @@
 #define TELEMETRY_TIMER_IRQHandler      TIM1_TRG_COM_TIM11_IRQHandler
 
 // PCBREV
-// #if defined(RADIO_X7)
-  // #define PCBREV_RCC_AHB1Periph         RCC_AHB1Periph_GPIOA
-  // #define PCBREV_GPIO                   GPIOA
-  // #define PCBREV_GPIO_PIN               GPIO_Pin_14  // PA.14
-  // #define PCBREV_GPIO_PULL_DOWN
-  // #define PCBREV_VALUE()                GPIO_ReadInputDataBit(PCBREV_GPIO, PCBREV_GPIO_PIN)
-// #else
+#if defined(RADIO_X7)
+  #define PCBREV_RCC_AHB1Periph         RCC_AHB1Periph_GPIOA
+  #define PCBREV_GPIO                   GPIOA
+  #define PCBREV_GPIO_PIN               GPIO_Pin_14  // PA.14
+  #define PCBREV_GPIO_PULL_DOWN
+  #define PCBREV_VALUE()                GPIO_ReadInputDataBit(PCBREV_GPIO, PCBREV_GPIO_PIN)
+#else
   #define PCBREV_RCC_AHB1Periph         0
-// #endif
+#endif
 
 
 // USB Charger