Use TOTAL_GPIO_COUNT instead of magic number 30

Author: dhalbert

ports/raspberrypi/common-hal/microcontroller/Pin.c

@@ -46,7 +46,7 @@ bool speaker_enable_in_use;
 STATIC uint32_t never_reset_pins;
 
 void reset_all_pins(void) {
-    for (size_t i = 0; i < 30; i++) {
+    for (size_t i = 0; i < TOTAL_GPIO_COUNT; i++) {
         if ((never_reset_pins & (1 << i)) != 0) {
             continue;
         }
@@ -55,15 +55,15 @@ void reset_all_pins(void) {
 }
 
 void never_reset_pin_number(uint8_t pin_number) {
-    if (pin_number >= 32) {
+    if (pin_number >= TOTAL_GPIO_COUNT) {
         return;
     }
 
     never_reset_pins |= 1 << pin_number;
 }
 
 void reset_pin_number(uint8_t pin_number) {
-    if (pin_number >= 32) {
+    if (pin_number >= TOTAL_GPIO_COUNT) {
         return;
     }
 
@@ -134,7 +134,7 @@ void claim_pin(const mcu_pin_obj_t* pin) {
 }
 
 bool pin_number_is_free(uint8_t pin_number) {
-    if (pin_number >= 30) {
+    if (pin_number >= TOTAL_GPIO_COUNT) {
         return false;
     }