f2fs: remove unneeded version.h header file from f2fs.h

Including <linux/version.h> is not necessary.
Signed-off-by: NSachin Kamat <sachin.kamat@linaro.org>

fs/f2fs/f2fs.h

@@ -14,7 +14,6 @@
 #include <linux/types.h>
 #include <linux/page-flags.h>
 #include <linux/buffer_head.h>
-#include <linux/version.h>
 #include <linux/slab.h>
 #include <linux/crc32.h>
 #include <linux/magic.h>