greenhills: fix the ioexpander/gpio.h build warning

CC:  mm_heap/mm_brkaddr.c "/home/guoshichao/work_profile/vela_os/vela_car_4/nuttx/include/nuttx/ioexpander/gpio.h", line 159: warning apache#381-D:
          extra ";" ignored
    uint8_t gp_pintype;  /* See enum gpio_pintype_e */;
                                                      ^

Signed-off-by: guoshichao <guoshichao@xiaomi.com>

include/nuttx/ioexpander/gpio.h

@@ -150,7 +150,7 @@ struct gpio_dev_s
    * driver when gpio_pin_register() is called.
    */
 
-  uint8_t gp_pintype;  /* See enum gpio_pintype_e */;
+  uint8_t gp_pintype;  /* See enum gpio_pintype_e */
 
   /* Writable storage used by the upper half driver */