gpio: davinci: fix build warning when !CONFIG_OF

This nukes the following warning that is seen when building without
OF support:

drivers/gpio/gpio-davinci.c:437:25: warning: ‘keystone_gpio_get_irq_chip’ defined but not used [-Wunused-function]
 static struct irq_chip *keystone_gpio_get_irq_chip(unsigned int irq)
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-davinci.c

@@ -610,14 +610,12 @@ static int davinci_gpio_irq_setup(struct platform_device *pdev)
 	return 0;
 }
 
-#if IS_ENABLED(CONFIG_OF)
 static const struct of_device_id davinci_gpio_ids[] = {
 	{ .compatible = "ti,keystone-gpio", keystone_gpio_get_irq_chip},
 	{ .compatible = "ti,dm6441-gpio", davinci_gpio_get_irq_chip},
 	{ /* sentinel */ },
 };
 MODULE_DEVICE_TABLE(of, davinci_gpio_ids);
-#endif
 
 static struct platform_driver davinci_gpio_driver = {
 	.probe		= davinci_gpio_probe,