Merge pull request #3045 from k0d/stm32_alignment_issue

Fixes issue with memory alignment in STM32

Author: tannewt

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

@@ -52,7 +52,7 @@ bool neopixel_in_use;
 #define GPIO_PORT_COUNT (MP_ARRAY_SIZE(ports))
 
 STATIC uint16_t claimed_pins[GPIO_PORT_COUNT];
-STATIC uint16_t never_reset_pins[GPIO_PORT_COUNT];
+STATIC uint16_t __ALIGNED(4) never_reset_pins[GPIO_PORT_COUNT];
 
 void reset_all_pins(void) {
     // Reset claimed pins