spi: oc-tiny: Remove unused of_gpio.h

of_gpio.h is deprecated and subject to remove.
The driver doesn't use it, simply remove the unused header.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20240417104730.2510856-1-andriy.shevchenko@linux.intel.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-oc-tiny.c

@@ -184,8 +184,6 @@ static irqreturn_t tiny_spi_irq(int irq, void *dev)
 }
 
 #ifdef CONFIG_OF
-#include <linux/of_gpio.h>
-
 static int tiny_spi_of_probe(struct platform_device *pdev)
 {
 	struct tiny_spi *hw = platform_get_drvdata(pdev);