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/event.c

@@ -18,10 +18,8 @@ static int do_event_list(struct cmd_tbl *cmdtp, int flag, int argc,
 	return 0;
 }
 
-#ifdef CONFIG_SYS_LONGHELP
-static char event_help_text[] =
-	"list - list event spies";
-#endif
+U_BOOT_LONGHELP(event,
+	"list - list event spies");
 
 U_BOOT_CMD_WITH_SUBCMDS(event, "Events", event_help_text,
 	U_BOOT_SUBCMD_MKENT(list, 1, 1, do_event_list));