gpio: davinci: Include proper header

This driver has no business including <linux/gpio.h>, it is a
driver so include <linux/gpio/driver.h>.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

drivers/gpio/gpio-davinci.c

@@ -9,7 +9,7 @@
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  */
-#include <linux/gpio.h>
+#include <linux/gpio/driver.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/clk.h>