bmw aux pins for o2 sensor (#4422)

* bmw aux

* those can be switch inputs too

firmware/config/boards/hellen/hellen88bmw/connectors/main.yaml

@@ -1,6 +1,7 @@
 # https://github.com/rusefi/rusefi/blob/master/firmware/config/boards/hellen/hellen_meta.h
 
 pins:
+# extension header pins
   - pin: PPS1
     # H144_IN_PPS
     id: EFI_ADC_3
@@ -25,6 +26,18 @@ pins:
     class: analog_inputs
     ts_name: Aux TPS3
 
+# Solder pads
+  - pin: VIN5
+    id: [EFI_ADC_0, A0]
+    class: [analog_inputs, switch_inputs]
+    ts_name: VIN5
+
+  - pin: VIN6
+    id: [EFI_ADC_1, A1]
+    class: [analog_inputs, switch_inputs]
+    ts_name: VIN6
+
+# Normal connector pins
   - pin: 1
     id: G14
     class: outputs