pinctrl: mediatek: moore: Fix build error

pinctrl: mediatek: moore: Fix build error

If EINT_MTK is m and PINCTRL_MTK_V2 is y, build fails:

drivers/pinctrl/mediatek/pinctrl-moore.o: In function `mtk_gpio_set_config':
pinctrl-moore.c:(.text+0xa6c): undefined reference to `mtk_eint_set_debounce'
drivers/pinctrl/mediatek/pinctrl-moore.o: In function `mtk_gpio_to_irq':
pinctrl-moore.c:(.text+0xacc): undefined reference to `mtk_eint_find_irq'

Select EINT_MTK for PINCTRL_MTK_V2 to fix this.

Fixes: 8174a8512e3e ("pinctrl: mediatek: make MediaTek pinctrl v2 driver ready for buidling loadable module")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Link: https://lore.kernel.org/r/20220409105958.37412-1-yuehaibing@huawei.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>