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/gardena/smart-gateway-mt7688/board.c b/board/gardena/smart-gateway-mt7688/board.c
index 89844ee..768e7ac 100644
--- a/board/gardena/smart-gateway-mt7688/board.c
+++ b/board/gardena/smart-gateway-mt7688/board.c
@@ -4,6 +4,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <env.h>
 #include <env_internal.h>
 #include <flash.h>
@@ -206,7 +207,7 @@
  * Helper function to provide some sane factory-data values for testing
  * purpose, when these values are not programmed correctly
  */
-int do_fd_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+int do_fd_write(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	struct factory_data_values *fd;
 	struct spi_flash *sf;