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/terminal.c

@@ -12,7 +12,7 @@
 #include <stdio_dev.h>
 #include <serial.h>
 
-int do_terminal(cmd_tbl_t * cmd, int flag, int argc, char * const argv[])
+int do_terminal(struct cmd_tbl *cmd, int flag, int argc, char *const argv[])
 {
 	int last_tilde = 0;
 	struct stdio_dev *dev = NULL;