[PATCH -mmotm] pinctrl: mediatek: fix build for tristate changes

[Randy Dunlap <rdunlap@xxxxxxxxxxxxx>]

From: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>

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 <rdunlap@xxxxxxxxxxxxx>
Cc: Sean Wang <sean.wang@xxxxxxxxxx>
Cc: linux-mediatek@xxxxxxxxxxxxxxxxxxx
---
 drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c |    1 +
 1 file changed, 1 insertion(+)

--- mmotm-2020-0727-1818.orig/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
+++ mmotm-2020-0727-1818/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c
@@ -264,6 +264,7 @@ bool mtk_is_virt_gpio(struct mtk_pinctrl
 
 	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,