updated ADC driver to use more of available inputs, as well as made input selection more sane

src/drv_adc.h

@@ -1,13 +1,16 @@
 #pragma once
 
-#define ADC_BATTERY     0
-#define ADC_CURRENT     1
+typedef enum {
+    ADC_BATTERY = 0,
+    ADC_EXTERNAL1 = 1,
+    ADC_EXTERNAL2 = 2,
+    ADC_CHANNEL_MAX = 3
+} AdcChannel;
 
 typedef struct drv_adc_config_t {
     uint8_t powerAdcChannel;     // which channel used for current monitor, allowed PA1, PB1 (ADC_Channel_1, ADC_Channel_9)
 } drv_adc_config_t;
 
-
 void adcInit(drv_adc_config_t *init);
 uint16_t adcGetChannel(uint8_t channel);
 #ifdef FY90Q