SMDKV310: Fix host compilation of mkv310_image

Fix compilation of mkv310_image host tool

tools/mkv310_image.c: In function 'main':
tools/mkv310_image.c:67: error: 'S_IRUSR' undeclared (first use in this function)
tools/mkv310_image.c:67: error: (Each undeclared identifier is reported only once
tools/mkv310_image.c:67: error: for each function it appears in.)
tools/mkv310_image.c:67: error: 'S_IWUSR' undeclared (first use in this function)
tools/mkv310_image.c:67: error: 'S_IRGRP' undeclared (first use in this function)
tools/mkv310_image.c:67: error: 'S_IWGRP' undeclared (first use in this function)
tools/mkv310_image.c:67: error: 'S_IROTH' undeclared (first use in this function)
tools/mkv310_image.c:67: error: 'S_IWOTH' undeclared (first use in this function)

resulting from a 'make smdkv310_config'.

Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>

mmc_spl/board/samsung/smdkv310/tools/mkv310_image.c

@@ -26,6 +26,7 @@
 #include <fcntl.h>
 #include <errno.h>
 #include <string.h>
+#include <sys/stat.h>
 
 #define CHECKSUM_OFFSET		(14*1024-4)
 #define BUFSIZE			(16*1024)