cmd: Convert existing long help messages to the new macro

- Generally we just drop the #ifdef CONFIG_SYS_LONGHELP and endif lines
  and use U_BOOT_LONGHELP to declare the same variable name as before
- In a few places, either rename the variable to follow convention or
  introduce the variable as it was being done inline before.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

cmd/help.c

@@ -29,7 +29,10 @@ U_BOOT_CMD(
 );
 
 #ifdef CONFIG_CMDLINE
-/* This does not use the U_BOOT_CMD macro as ? can't be used in symbol names */
+/*
+ * This does not use the U_BOOT_CMD macro as ? can't be used in symbol names
+ * nor can we rely on the CONFIG_SYS_LONGHELP helper macro
+ */
 ll_entry_declare(struct cmd_tbl, question_mark, cmd) = {
 	"?",	CONFIG_SYS_MAXARGS, cmd_always_repeatable,	do_help,
 	"alias for 'help'",