gpio: pxa: avoid attempting to set pin direction via pinctrl on MMP2

Similarly to PXA3xx, pinctrl-single can't set pin direction on MMP2 either.
See also: commit 9dabfdd ("gpio: pxa: disable pinctrl calls for
PXA3xx")

Cc: stable@vger.kernel.org
Fixes: a770d94 ("gpio: pxa: add pin control gpio direction and request")
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Acked-by: Pavel Machek <pavel@ucw.cz>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-pxa.c

@@ -245,6 +245,7 @@ static bool pxa_gpio_has_pinctrl(void)
 {
 	switch (gpio_type) {
 	case PXA3XX_GPIO:
+	case MMP2_GPIO:
 		return false;
 
 	default: