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>
        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,