Move all command code into its own directory

There are a lot of unrelated files in common, including all of the commands.
Moving them into their own directory makes them easier to find and is more
logical.

Some commands include non-command code, such as cmd_scsi.c. This should be
sorted out at some point so that the function can be enabled with or without
the associated command.

Unfortunately, with m68k I get this error:

m68k:  +   M5329AFEE
+arch/m68k/cpu/mcf532x/start.o: In function `_start':
+arch/m68k/cpu/mcf532x/start.S:159:(.text+0x452): relocation truncated to fit: R_68K_PC16 against symbol `board_init_f' defined in .text.board_init_f section in common/built-in.o

I hope someone can shed some light on what this means. I hope it isn't
depending on the position of code in the image.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heiko Schocher <hs@denx.de>
Acked-by: Stefan Roese <sr@denx.de>
Acked-by: Przemyslaw Marczak <p.marczak@samsung.com>

cmd/cmd_help.c

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2000-2009
+ * Wolfgang Denk, DENX Software Engineering, wd@denx.de.
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <command.h>
+
+static int do_help(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	cmd_tbl_t *start = ll_entry_start(cmd_tbl_t, cmd);
+	const int len = ll_entry_count(cmd_tbl_t, cmd);
+	return _do_help(start, len, cmdtp, flag, argc, argv);
+}
+
+U_BOOT_CMD(
+	help,	CONFIG_SYS_MAXARGS,	1,	do_help,
+	"print command description/usage",
+	"\n"
+	"	- print brief description of all commands\n"
+	"help command ...\n"
+	"	- print detailed usage of 'command'"
+);
+
+/* This does not use the U_BOOT_CMD macro as ? can't be used in symbol names */
+ll_entry_declare(cmd_tbl_t, question_mark, cmd) = {
+	"?",	CONFIG_SYS_MAXARGS,	1,	do_help,
+	"alias for 'help'",
+#ifdef  CONFIG_SYS_LONGHELP
+	""
+#endif /* CONFIG_SYS_LONGHELP */
+};