USB: gadget: pxa27x_udc: 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/20240307113936.3642469-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/udc/pxa27x_udc.c

@@ -24,7 +24,6 @@
 #include <linux/byteorder/generic.h>
 #include <linux/platform_data/pxa2xx_udc.h>
 #include <linux/of.h>
-#include <linux/of_gpio.h>
 
 #include <linux/usb.h>
 #include <linux/usb/ch9.h>