ARM: dts: s3c64xx: Use common macros for pinctrl configuration

Replace duplicated macros in each DTSI file with a common macro coming
from header.  Include the header in each pinctrl DTSI so further changes
could use it.

Although PIN_FUNC_SPC_2 does not bring much information about the
function itself, it still is more descriptive then hard-coded
number <2>.

Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Reviewed-by: Javier Martinez Canillas <javier@osg.samsung.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

arch/arm/boot/dts/s3c6410-mini6410.dts

@@ -201,13 +201,13 @@
 &pinctrl0 {
 	gpio_leds: gpio-leds {
 		samsung,pins = "gpk-4", "gpk-5", "gpk-6", "gpk-7";
-		samsung,pin-pud = <PIN_PULL_NONE>;
+		samsung,pin-pud = <S3C64XX_PIN_PULL_NONE>;
 	};
 
 	gpio_keys: gpio-keys {
 		samsung,pins = "gpn-0", "gpn-1", "gpn-2", "gpn-3",
 				"gpn-4", "gpn-5", "gpl-11", "gpl-12";
-		samsung,pin-pud = <PIN_PULL_NONE>;
+		samsung,pin-pud = <S3C64XX_PIN_PULL_NONE>;
 	};
 };