commands/hdparm: Restrict hdparm command when locked down

The command can be used to get/set ATA disk parameters. Some of these can
be dangerous since change the disk behavior. Restrict it when locked down.

Signed-off-by: Javier Martinez Canillas <javierm@redhat.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

grub-core/commands/hdparm.c

@@ -436,7 +436,7 @@ static grub_extcmd_t cmd;
 
 GRUB_MOD_INIT(hdparm)
 {
-  cmd = grub_register_extcmd ("hdparm", grub_cmd_hdparm, 0,
+  cmd = grub_register_extcmd_lockdown ("hdparm", grub_cmd_hdparm, 0,
 				       N_("[OPTIONS] DISK"),
 				       N_("Get/set ATA disk parameters."), options);
 }