PINS_DEBUGGING support on STM32G0B1RE

Resolves issue MarlinFirmware#23386 by adding missing NUM_ANALOG_FIRST.

Updates VALID_PIN so analog pins starting at 0xc0; which is
great than NUM_PINS_TOTAL; are not filtered out of M43 output.

Updates "M42 P" output to start at P0 instead of P4.  First
11 analog pins are printed correctly but A11 is incorrectly
shown as P19 instead of P26.

Marlin/src/HAL/STM32/pinsDebug.h

@@ -112,7 +112,7 @@ const XrefInfo pin_xref[] PROGMEM = {
   #define HAS_HIGH_ANALOG_PINS 1
 #endif
 #define NUMBER_PINS_TOTAL NUM_DIGITAL_PINS + TERN0(HAS_HIGH_ANALOG_PINS, NUM_ANALOG_INPUTS)
-#define VALID_PIN(ANUM) ((ANUM) >= 0 && (ANUM) < NUMBER_PINS_TOTAL)
+#define VALID_PIN(ANUM) (((ANUM) >= 0 && (ANUM) < NUM_DIGITAL_PINS) TERN_(HAS_HIGH_ANALOG_PINS, || ((ANUM) >= NUM_ANALOG_FIRST  && (ANUM) < NUM_ANALOG_FIRST+NUM_ANALOG_INPUTS)))
 #define digitalRead_mod(Ard_num) extDigitalRead(Ard_num)  // must use Arduino pin numbers when doing reads
 #define PRINT_PIN(Q)
 #define PRINT_PIN_ANALOG(p) do{ sprintf_P(buffer, PSTR(" (A%2d)  "), DIGITAL_PIN_TO_ANALOG_PIN(pin)); SERIAL_ECHO(buffer); }while(0)
@@ -206,8 +206,11 @@ void port_print(const pin_t Ard_num) {
     SERIAL_ECHO_SP(7);
 
   // Print number to be used with M42
-  int calc_p = Ard_num % (NUM_DIGITAL_PINS + 1);
-  if (Ard_num > NUM_DIGITAL_PINS && calc_p > 7) calc_p += 8;
+  int calc_p = Ard_num;
+  if (Ard_num > NUM_DIGITAL_PINS) {
+    calc_p -= NUM_ANALOG_FIRST;
+    if (calc_p > 7) calc_p += 8;
+  }
   SERIAL_ECHOPGM(" M42 P", calc_p);
   SERIAL_CHAR(' ');
   if (calc_p < 100) {

buildroot/share/PlatformIO/variants/MARLIN_G0B1RE/variant_MARLIN_STM32G0B1RE.h

@@ -124,6 +124,7 @@
 #define NUM_DIGITAL_PINS        62
 #define NUM_REMAP_PINS          2
 #define NUM_ANALOG_INPUTS       16
+#define NUM_ANALOG_FIRST        PA0
 
 // SPI definitions
 #ifndef PIN_SPI_SS