gpio: mockup: change the type of value field in line state struct

GPIO values are universally represented as integers. Change the type
of the variable storing the current line value to int for consistency.
Signed-off-by: NBartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: NLinus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-mockup.c

@@ -48,7 +48,7 @@ enum {
  */
 struct gpio_mockup_line_status {
 	int dir;
-	bool value;
+	int value;
 };
 
 struct gpio_mockup_chip {