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/renesas/sh7752evb/sh7752evb.c b/board/renesas/sh7752evb/sh7752evb.c
index 565ce5f..c6e0c12 100644
--- a/board/renesas/sh7752evb/sh7752evb.c
+++ b/board/renesas/sh7752evb/sh7752evb.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <env.h>
 #include <flash.h>
 #include <init.h>
@@ -245,7 +246,7 @@
 }
 
 #ifdef CONFIG_DEPRECATED
-int do_write_mac(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_write_mac(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	int i, ret;
 	char mac_string[256];