[nrf fromtree] drivers: gpio: gpio_nrfx: store init output val for get_config

The nRF GPIO hardware does not store the initial output value
set resulting from gpio_pin_configure() and thus, when
gpio_get_config() is used, the initial value is not returned.

This commit just reads the output value and sets the INIT
value to match in gpio_get_config().

Signed-off-by: Bjarki Arge Andreasen <[email protected]>
(cherry picked from commit 08269963370be2188a7c1898066f0fd6a3c8cbeb)

Author: bjarki-andreasen

drivers/gpio/gpio_nrfx.c

@@ -254,6 +254,9 @@ static int gpio_nrfx_pin_get_config(const struct device *port, gpio_pin_t pin,
 
 	if (dir == NRF_GPIO_PIN_DIR_OUTPUT) {
 		*flags |= GPIO_OUTPUT;
+		*flags |= nrf_gpio_pin_out_read(abs_pin)
+			? GPIO_OUTPUT_INIT_HIGH
+			: GPIO_OUTPUT_INIT_LOW;
 	}
 
 	nrf_gpio_pin_input_t input = nrf_gpio_pin_input_get(abs_pin);