🔨 Fix PINS_DEBUGGING for some STM32H7 (#26416)

buildroot/share/PlatformIO/variants/MARLIN_H723VG/variant_MARLIN_STM32H723VG.h

@@ -161,6 +161,7 @@
 #define NUM_DIGITAL_PINS        82
 #define NUM_DUALPAD_PINS        2
 #define NUM_ANALOG_INPUTS       16
+#define NUM_ANALOG_FIRST        PA0
 
 // On-board LED pin number
 #ifndef LED_BUILTIN

buildroot/share/PlatformIO/variants/MARLIN_H723ZE/variant_MARLIN_STM32H723ZE.h

@@ -200,6 +200,7 @@
 #define NUM_DIGITAL_PINS        114
 #define NUM_DUALPAD_PINS        2
 #define NUM_ANALOG_INPUTS       28
+#define NUM_ANALOG_FIRST        PA0
 
 // On-board LED pin number
 #ifndef LED_BUILTIN

buildroot/share/PlatformIO/variants/MARLIN_H743VI/variant_MARLIN_STM32H743VI.h

@@ -160,6 +160,7 @@
 #define NUM_DIGITAL_PINS        82
 #define NUM_DUALPAD_PINS        2
 #define NUM_ANALOG_INPUTS       16
+#define NUM_ANALOG_FIRST        PA0
 
 // On-board LED pin number
 #ifndef LED_BUILTIN