ARM: dts: Correct pin configuration of SD 4 for exynos4x12-pinctrl

This patch corrects the pin function value of sd4_bus8
from 3 to 4. This is verified on origen board for testing
eMMC on dw_mci controller.
Signed-off-by: Shirish S <s.shirish@samsung.com>
Signed-off-by: Alim Akhtar <alim.akhtar@samsung.com>
Reviewed-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Kukjin Kim <kgene.kim@samsung.com>

arch/arm/boot/dts/exynos4x12-pinctrl.dtsi

@@ -661,7 +661,7 @@ sd4_bus4: sd4-bus-width4 {
 
 		sd4_bus8: sd4-bus-width8 {
 			samsung,pins = "gpk1-3", "gpk1-4", "gpk1-5", "gpk1-6";
-			samsung,pin-function = <3>;
+			samsung,pin-function = <4>;
 			samsung,pin-pud = <4>;
 			samsung,pin-drv = <3>;
 		};