Automatically detect FlySky digital hall sticks on X10-class radios without necessity of build-time CMake option FLYSKY_HALL_STICKS.

Added special UART4 init to sample if FlySky sticks are present or not.
Added boolean globalData.flyskygimbals to save the detection result.
Removed FLYSKY_HALL_STICKS and FLYSKY_HALL_STICKS_REVERSE CMake build options.

Tested on two RM TX16S radios, one with FlySky digital hall sticks and second with stock analog sticks.

radio/src/hal/adc_driver.cpp

@@ -125,10 +125,24 @@ bool adcRead()
 {
   uint16_t temp[NUM_ANALOGS] = { 0 };
 
+  uint8_t first_analog_adc;
+#if defined(RADIO_FAMILY_T16) || defined(PCBNV14)
+    if (globalData.flyskygimbals)
+    {
+        first_analog_adc = FIRST_ANALOG_ADC_FS;
+    } else
+    {
+        first_analog_adc = FIRST_ANALOG_ADC;
+    }
+#else
+    first_analog_adc = FIRST_ANALOG_ADC;
+#endif
+
+
   for (int i=0; i<4; i++) {
     if (!adcSingleRead())
         return false;
-    for (uint8_t x=FIRST_ANALOG_ADC; x<NUM_ANALOGS; x++) {
+    for (uint8_t x=first_analog_adc; x<NUM_ANALOGS; x++) {
       uint16_t val = adcValues[x];
 #if defined(JITTER_MEASURE)
       if (JITTER_MEASURE_ACTIVE()) {
@@ -139,7 +153,7 @@ bool adcRead()
     }
   }
 
-  for (uint8_t x=FIRST_ANALOG_ADC; x<NUM_ANALOGS; x++) {
+  for (uint8_t x=first_analog_adc; x<NUM_ANALOGS; x++) {
     adcValues[x] = temp[x] >> 2;
   }