The M5Core2 and M5Tough have 40 pins (#6315)

Summary

The M5Core2 and the very similar M5Tough have 40 digital pins

See reference here: https://docs.m5stack.com/en/core/core2 as well as the constant declarations in the bottom part of the file.

Impact

Without this, Code that needs the total number of pins (e.g. firmata) doesn't show the higher pin numbers correctly.

Author: pgrawehr

Diff for: variants/m5stack_core2/pins_arduino.h

@@ -4,7 +4,7 @@
 #include <stdint.h>
 
 #define EXTERNAL_NUM_INTERRUPTS 16
-#define NUM_DIGITAL_PINS        20
+#define NUM_DIGITAL_PINS        40
 #define NUM_ANALOG_INPUTS       16
 
 #define analogInputToDigitalPin(p)  (((p)<20)?(analogChannelToDigitalPin(p)):-1)