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>

test/command_ut.c

@@ -7,12 +7,14 @@
 
 #include <common.h>
 #include <command.h>
+#include <env.h>
 
 static const char test_cmd[] = "setenv list 1\n setenv list ${list}2; "
 		"setenv list ${list}3\0"
 		"setenv list ${list}4";
 
-static int do_ut_cmd(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+static int do_ut_cmd(struct cmd_tbl *cmdtp, int flag, int argc,
+		     char *const argv[])
 {
 	printf("%s: Testing commands\n", __func__);
 	run_command("env default -f -a", 0);