feat(MT12): Enable AUX Serial when BT not defined (#4431)

radio/src/targets/taranis/CMakeLists.txt

@@ -235,7 +235,6 @@ elseif(PCB STREQUAL X7)
     set(ROTARY_ENCODER YES)
     set(BLUETOOTH NO)
     set(USB_CHARGER YES)
-    set(AUX_SERIAL NO)
     set(HELI NO)
     add_definitions(-DRADIO_MT12)
     add_definitions(-DMANUFACTURER_RADIOMASTER)
@@ -243,6 +242,9 @@ elseif(PCB STREQUAL X7)
     set(ENABLE_SERIAL_PASSTHROUGH ON CACHE BOOL "Enable serial passthrough")
     set(LUA_MIXER YES)
     set(FLEXSW "2" CACHE STRING "Max flex inputs usable as switches")
+    if (NOT BLUETOOTH)
+      set(AUX_SERIAL ON)
+    endif()
   elseif(PCBREV STREQUAL BOXER)
     set(DEFAULT_INTERNAL_MODULE CROSSFIRE CACHE STRING "Default internal module")
     set(INTERNAL_MODULE_SERIAL YES)

radio/src/targets/taranis/hal.h

@@ -2171,7 +2171,7 @@
 #endif
 
 // Serial Port
-#if (defined(PCBX7) && !defined(RADIO_ZORRO) && !defined(RADIO_TX12MK2)) && !defined(RADIO_BOXER) && !defined(RADIO_POCKET) || defined(PCBXLITE) || defined(PCBX9LITE) || defined(RADIO_X9DP2019)
+#if (defined(PCBX7) && !defined(AUX_SERIAL)) || defined(PCBXLITE) || defined(PCBX9LITE) || defined(RADIO_X9DP2019)
 #else
   #define HARDWARE_TRAINER_AUX_SERIAL
   #define AUX_SERIAL_GPIO                   GPIOB