zephyr/mpconfigport: Fix mp_int_t and mp_uint_t to work on 64-bit archs.

These both need to fit a pointer, so make them `intptr_t` and `uintptr_t`,
similar to other ports.

Signed-off-by: Anton Blanchard <antonb@tenstorrent.com>

Author: antonblanchard

ports/zephyr/mpconfigport.h

@@ -139,8 +139,8 @@ void mp_hal_signal_event(void);
 #define MICROPY_HW_MCU_NAME "unknown-cpu"
 #endif
 
-typedef int mp_int_t; // must be pointer size
-typedef unsigned mp_uint_t; // must be pointer size
+typedef intptr_t mp_int_t; // must be pointer size
+typedef uintptr_t mp_uint_t; // must be pointer size
 typedef long mp_off_t;
 
 #define MP_STATE_PORT MP_STATE_VM