gpio: pxa: remove unused gpio_is_pxa_type function

clang with W=1 reports
drivers/gpio/gpio-pxa.c:174:19: error: unused function
  'gpio_is_pxa_type' [-Werror,-Wunused-function]
static inline int gpio_is_pxa_type(int type)
                  ^
This function is not used, so remove it.

Signed-off-by: Tom Rix <trix@redhat.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

Author: Tom Rix

drivers/gpio/gpio-pxa.c

@@ -171,11 +171,6 @@ static inline struct pxa_gpio_bank *gpio_to_pxabank(struct gpio_chip *c,
 	return chip_to_pxachip(c)->banks + gpio / 32;
 }
 
-static inline int gpio_is_pxa_type(int type)
-{
-	return (type & MMP_GPIO) == 0;
-}
-
 static inline int gpio_is_mmp_type(int type)
 {
 	return (type & MMP_GPIO) != 0;