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/board/Arcturus/ucp1020/cmd_arc.c b/board/Arcturus/ucp1020/cmd_arc.c
index 2b4853f..3656cf4 100644
--- a/board/Arcturus/ucp1020/cmd_arc.c
+++ b/board/Arcturus/ucp1020/cmd_arc.c
@@ -9,6 +9,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <cpu_func.h>
 #include <div64.h>
 #include <env.h>
@@ -376,7 +377,8 @@
 		do_get_arc_info();
 }
 
-static int do_arc_cmd(cmd_tbl_t * cmdtp, int flag, int argc, char *const argv[])
+static int do_arc_cmd(struct cmd_tbl *cmdtp, int flag, int argc,
+		      char *const argv[])
 {
 	const char *cmd;
 	int ret = -1;