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/drivers/video/cfb_console.c b/drivers/video/cfb_console.c
index 5442bac..8918d83 100644
--- a/drivers/video/cfb_console.c
+++ b/drivers/video/cfb_console.c
@@ -65,6 +65,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <cpu_func.h>
 #include <env.h>
 #include <fdtdec.h>
@@ -1710,7 +1711,8 @@
 			1);
 }
 
-static int do_clrlogo(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_clrlogo(struct cmd_tbl *cmdtp, int flag, int argc,
+		      char *const argv[])
 {
 	if (argc != 1)
 		return cmd_usage(cmdtp);