pinctrl: meson: wire up the gpio_chip's set_config callback

Use gpiochip_generic_config for the gpio_chip's set_config callback so
GPIO flags like GPIO_PULL_UP or GPIO_PULL_DOWN can be used in the board
.dts descriptions.
This is required for some Meson8m2 boards where GPIO_BSD_EN provides the
"MUTE" signal and requires enabling the internal pull-up resistor.

Signed-off-by: Martin Blumenstingl <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/meson/pinctrl-meson.c

···
 	pc->chip.parent = pc->dev;
 	pc->chip.request = gpiochip_generic_request;
 	pc->chip.free = gpiochip_generic_free;
+	pc->chip.set_config = gpiochip_generic_config;
 	pc->chip.get_direction = meson_gpio_get_direction;
 	pc->chip.direction_input = meson_gpio_direction_input;
 	pc->chip.direction_output = meson_gpio_direction_output;