ARM: s3c24xx: sdhci: include plat/sdhci.h header

Include plat/sdhci.h header in the sdhci code to bring the prototypes of
defined functions and fix W=1 compile warnings:

    arch/arm/mach-s3c24xx/setup-sdhci-gpio.c:21:6: warning: no previous prototype for 's3c2416_setup_sdhci0_cfg_gpio' [-Wmissing-prototypes]
    arch/arm/mach-s3c24xx/setup-sdhci-gpio.c:26:6: warning: no previous prototype for 's3c2416_setup_sdhci1_cfg_gpio' [-Wmissing-prototypes]
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>

arch/arm/mach-s3c24xx/setup-sdhci-gpio.c

@@ -17,6 +17,7 @@
 #include <mach/regs-gpio.h>
 #include <mach/gpio-samsung.h>
 #include <plat/gpio-cfg.h>
+#include <plat/sdhci.h>
 
 void s3c2416_setup_sdhci0_cfg_gpio(struct platform_device *dev, int width)
 {