command: Remove the cmd_tbl_t typedef

We should not use typedefs in U-Boot. They cannot be used as forward
declarations which means that header files must include the full header to
access them.

Drop the typedef and rename the struct to remove the _s suffix which is
now not useful.

This requires quite a few header-file additions.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/cmd/zfs.c b/cmd/zfs.c
index 2b622a8..e429ac8 100644
--- a/cmd/zfs.c
+++ b/cmd/zfs.c
@@ -32,7 +32,8 @@
 #define DOS_FS_TYPE_OFFSET	0x36
 #define DOS_FS32_TYPE_OFFSET	0x52
 
-static int do_zfs_load(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_zfs_load(struct cmd_tbl *cmdtp, int flag, int argc,
+		       char *const argv[])
 {
 	char *filename = NULL;
 	int dev;
@@ -129,8 +130,8 @@
 }
 
 
-
-static int do_zfs_ls(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_zfs_ls(struct cmd_tbl *cmdtp, int flag, int argc,
+		     char *const argv[])
 {
 	const char *filename = "/";
 	int part;