gpiolib: swnode: Remove wrong header inclusion

The flags in the software node properties are supposed to be
the GPIO lookup flags, which are provided by gpio/machine.h,
as the software nodes are the kernel internal thing and doesn't
need to rely to any of ABIs.

Fixes: e7f9ff5d ("gpiolib: add support for software nodes")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>

include/linux/gpio/property.h

@@ -2,7 +2,6 @@
 #ifndef __LINUX_GPIO_PROPERTY_H
 #define __LINUX_GPIO_PROPERTY_H
 
-#include <dt-bindings/gpio/gpio.h> /* for GPIO_* flags */
 #include <linux/property.h>
 
 #define PROPERTY_ENTRY_GPIO(_name_, _chip_node_, _idx_, _flags_) \