stm32/boards/make-pins.py: Fix H7 ADC generation.

Fixes are:
- Only emit ADC table entries for pins that aren't cpu-hidden
  (i.e. ignore `X,-Y` rows).
- Only use the P channels on H7.
Signed-off-by: Jim Mussared <jim.mussared@gmail.com>

ports/stm32/boards/make-pins.py

@@ -135,7 +135,11 @@ class Stm32Pin(boardgen.Pin):
                     "Invalid adc '{:s}' for pin '{:s}'".format(adc_name, self.name())
                 )
             adc_units = [int(x) for x in m.group(1)]
-            _adc_mode = m.group(2)
+            adc_mode = m.group(2)
+            if adc_mode == "INN":
+                # On H7 we have INN/INP, all other parts use IN only. Only use
+                # IN or INP channels.
+                continue
             adc_channel = int(m.group(3))
 
             # Pick the entry with the most ADC units, e.g. "ADC1_INP16/ADC12_INN1/ADC12_INP0" --> "ADC12_INN1".
@@ -247,6 +251,8 @@ class Stm32PinGenerator(boardgen.PinGenerator):
             )
             # Don't include pins that weren't in pins.csv.
             for pin in self.available_pins():
+                if pin._hidden:
+                    continue
                 if adc_unit in pin._adc_units:
                     print(
                         "    [{:d}] = {:s},".format(pin._adc_channel, self._cpu_pin_pointer(pin)),