esp8266/main: Use new cstack API and add a stack margin of 64 bytes.

The margin of 64 bytes is needed to get `micropython/extreme_exc.py` to
pass when run via-mpy.

Signed-off-by: Damien George <damien@micropython.org>

Author: dpgeorge

ports/esp8266/main.c

@@ -31,7 +31,6 @@
 #include "py/builtin.h"
 #include "py/compile.h"
 #include "py/runtime.h"
-#include "py/stackctrl.h"
 #include "py/mperrno.h"
 #include "py/mphal.h"
 #include "py/gc.h"
@@ -108,8 +107,7 @@ static void print_reset_info(void) {
 #endif
 
 static void mp_reset(void) {
-    mp_stack_set_top((void *)0x40000000);
-    mp_stack_set_limit(8192);
+    mp_cstack_init_with_top((void *)0x40000000, 8192);
     mp_hal_init();
     gc_init(heap, heap + sizeof(heap));
     mp_init();

ports/esp8266/mpconfigport.h

@@ -52,6 +52,7 @@
 #define MICROPY_ALLOC_PARSE_CHUNK_INIT  (64)
 #define MICROPY_DEBUG_PRINTER       (&mp_debug_print)
 #define MICROPY_ENABLE_GC           (1)
+#define MICROPY_STACK_CHECK_MARGIN  (64)
 #define MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF (1)
 #define MICROPY_REPL_EVENT_DRIVEN   (0)
 #define MICROPY_USE_INTERNAL_ERRNO  (1)