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/lib/dhry/cmd_dhry.c b/lib/dhry/cmd_dhry.c
index 2950483..d55ab54 100644
--- a/lib/dhry/cmd_dhry.c
+++ b/lib/dhry/cmd_dhry.c
@@ -8,7 +8,8 @@
 #include <div64.h>
 #include "dhry.h"
 
-static int do_dhry(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_dhry(struct cmd_tbl *cmdtp, int flag, int argc,
+		   char *const argv[])
 {
 	ulong start, duration, vax_mips;
 	u64 dhry_per_sec;