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/arch/x86/lib/zimage.c b/arch/x86/lib/zimage.c
index ffc0963..64d14e8 100644
--- a/arch/x86/lib/zimage.c
+++ b/arch/x86/lib/zimage.c
@@ -13,6 +13,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <env.h>
 #include <irq_func.h>
 #include <malloc.h>
@@ -310,7 +311,7 @@
 {
 }
 
-int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
+int do_zboot(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 {
 	struct boot_params *base_ptr;
 	void *bzImage_addr = NULL;