fat: Prepare API change for files greater than 2GB

Change the internal FAT functions to use loff_t for offsets.

Signed-off-by: Suriyan Ramasami <suriyan.r@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>
[trini: Fix fs/fat/fat.c for min3 updates]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/fs/fat/file.c b/fs/fat/file.c
index d910c46..8970611 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -162,8 +162,7 @@
 	return filesystems[current_filesystem].ls(arg);
 }
 
-long
-file_read(const char *filename, void *buffer, unsigned long maxsize)
+int file_read(const char *filename, void *buffer, int maxsize)
 {
 	char fullpath[1024];
 	const char *arg;