gpio: Pass a flag to gpiochip_request_own_desc()

Before things go out of hand, make it possible to pass
flags when requesting "own" descriptors from a gpio_chip.
This is necessary if the chip wants to request a GPIO with
active low semantics, for example.

Cc: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Cc: Jason Cooper <jason@lakedaemon.net>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Roger Quadros <rogerq@ti.com>
Reviewed-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/memory/omap-gpmc.c

@@ -2170,7 +2170,8 @@ static int gpmc_probe_generic_child(struct platform_device *pdev,
 		unsigned int wait_pin = gpmc_s.wait_pin;
 
 		waitpin_desc = gpiochip_request_own_desc(&gpmc->gpio_chip,
-							 wait_pin, "WAITPIN");
+							 wait_pin, "WAITPIN",
+							 0);
 		if (IS_ERR(waitpin_desc)) {
 			dev_err(&pdev->dev, "invalid wait-pin: %d\n", wait_pin);
 			ret = PTR_ERR(waitpin_desc);