fix(pycardium): Return on nlr_jump_fail()

Instead of "rebooting" Pycardium, hand over control to core 0, notifying
it of a severe failure via epic_exit(253).

Signed-off-by: Rahix <rahix@rahix.de>

pycardium/mphalport.c

@@ -283,14 +283,12 @@ mp_uint_t mp_hal_ticks_us(void)
  * Fatal Errors
  */
 
-extern NORETURN void *Reset_Handler(void);
-
 void NORETURN nlr_jump_fail(void *val)
 {
 	char msg[] = " >>> nlr_jump_fail <<<\r\n";
 	epic_uart_write_str(msg, sizeof(msg));
 
-	Reset_Handler();
+	epic_exit(253);
 }
 
 /******************************************************************************