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/log.c

@@ -375,8 +375,7 @@ static int do_log_rec(struct cmd_tbl *cmdtp, int flag, int argc,
 	return 0;
 }
 
-#ifdef CONFIG_SYS_LONGHELP
-static char log_help_text[] =
+U_BOOT_LONGHELP(log,
 	"level [<level>] - get/set log level\n"
 	"categories - list log categories\n"
 	"drivers - list log drivers\n"
@@ -405,9 +404,7 @@ static char log_help_text[] =
 	"\tc=category, l=level, F=file, L=line number, f=function, m=msg\n"
 	"\tor 'default', or 'all' for all\n"
 	"log rec <category> <level> <file> <line> <func> <message> - "
-		"output a log record"
-	;
-#endif
+		"output a log record");
 
 U_BOOT_CMD_WITH_SUBCMDS(log, "log system", log_help_text,
 	U_BOOT_SUBCMD_MKENT(level, 2, 1, do_log_level),