all: Rename the "NORETURN" macro to "MP_NORETURN".

This commit renames the NORETURN macro, indicating to the compiler
that a function does not return, into MP_NORETURN to maintain the same
naming convention of other similar macros.

To maintain compaitiblity with existing code NORETURN is aliased to
MP_NORETURN, but it is also deprecated for MicroPython v2.

This changeset was created using a similar process to
decf8e6a8b ("all: Remove the "STATIC"
macro and just use "static" instead."), with no documentation or python
scripts to change to reflect the new macro name.

Signed-off-by: Alessandro Gatti <a.gatti@frob.it>

ports/alif/main.c

@@ -56,7 +56,7 @@
 extern uint8_t __StackTop, __StackLimit;
 extern uint8_t __GcHeapStart, __GcHeapEnd;
 
-NORETURN void panic(const char *msg) {
+MP_NORETURN void panic(const char *msg) {
     mp_hal_stdout_tx_strn("\nFATAL ERROR:\n", 14);
     mp_hal_stdout_tx_strn(msg, strlen(msg));
     for (;;) {

ports/alif/modmachine.c

@@ -47,11 +47,11 @@ static mp_obj_t mp_machine_unique_id(void) {
     return mp_obj_new_bytes(id, sizeof(id));
 }
 
-NORETURN static void mp_machine_reset(void) {
+MP_NORETURN static void mp_machine_reset(void) {
     se_services_reset_soc();
 }
 
-NORETURN void mp_machine_bootloader(size_t n_args, const mp_obj_t *args) {
+MP_NORETURN void mp_machine_bootloader(size_t n_args, const mp_obj_t *args) {
     __disable_irq();
 
     MICROPY_BOARD_ENTER_BOOTLOADER(n_args, args);
@@ -112,7 +112,7 @@ static void mp_machine_lightsleep(size_t n_args, const mp_obj_t *args) {
     #endif
 }
 
-NORETURN static void mp_machine_deepsleep(size_t n_args, const mp_obj_t *args) {
+MP_NORETURN static void mp_machine_deepsleep(size_t n_args, const mp_obj_t *args) {
     #if MICROPY_HW_ENABLE_USBDEV
     mp_machine_enable_usb(false);
     #endif