btrfs: remove remaining unused message helpers

Remove the critical level message helpers as they're not used, the RCU
protection is provided by the plain helpers.

Reviewed-by: Daniel Vacek <neelx@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

fs/btrfs/messages.h

@@ -49,18 +49,6 @@ void _btrfs_printk(const struct btrfs_fs_info *fs_info, const char *fmt, ...);
 #define btrfs_info(fs_info, fmt, args...) \
 	btrfs_printk_in_rcu(fs_info, KERN_INFO fmt, ##args)
 
-/*
- * Wrappers that use printk in RCU
- */
-#define btrfs_crit_in_rcu(fs_info, fmt, args...) \
-	btrfs_printk_in_rcu(fs_info, KERN_CRIT fmt, ##args)
-
-/*
- * Wrappers that use a ratelimited printk in RCU
- */
-#define btrfs_crit_rl_in_rcu(fs_info, fmt, args...) \
-	btrfs_printk_rl_in_rcu(fs_info, KERN_CRIT fmt, ##args)
-
 /*
  * Wrappers that use a ratelimited printk
  */