pinctrl: mediatek: fix build for tristate changes

Export mtk_is_virt_gpio() for the case when
CONFIG_PINCTRL_MTK=y
CONFIG_PINCTRL_MTK_V2=y
CONFIG_PINCTRL_MTK_MOORE=y
CONFIG_PINCTRL_MTK_PARIS=m

to fix this build error:

ERROR: modpost: "mtk_is_virt_gpio" [drivers/pinctrl/mediatek/pinctrl-paris.ko] undefined!

Signed-off-by: Randy Dunlap <[email protected]>
Cc: Sean Wang <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Linus Walleij <[email protected]>

Author: rddunlap

drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c

@@ -264,6 +264,7 @@ bool mtk_is_virt_gpio(struct mtk_pinctrl *hw, unsigned int gpio_n)
 
 	return virt_gpio;
 }
+EXPORT_SYMBOL_GPL(mtk_is_virt_gpio);
 
 static int mtk_xt_get_gpio_n(void *data, unsigned long eint_n,
 			     unsigned int *gpio_n,