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>

cmd/disk.c

@@ -10,7 +10,7 @@
 #include <image.h>
 #include <part.h>
 
-int common_diskboot(cmd_tbl_t *cmdtp, const char *intf, int argc,
+int common_diskboot(struct cmd_tbl *cmdtp, const char *intf, int argc,
 		    char *const argv[])
 {
 	__maybe_unused int dev;