stm32/gccollect: Use gchelper.h header instead of explicit declaration.
#include "py/obj.h"
#include "py/gc.h"
#include "py/mpthread.h"
+#include "lib/utils/gchelper.h"
#include "gccollect.h"
#include "systick.h"
-uintptr_t gc_helper_get_regs_and_sp(uintptr_t *regs);
-
void gc_collect(void) {
// get current time, in case we want to time the GC
#if 0
