erofs: remove redundant erofs_fs_type declaration in super.c

As erofs_fs_type has been declared in internal.h, there is no use to
declare repeatedly in super.c.
Signed-off-by: Ferry Meng <mengferry@linux.alibaba.com>
Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com>
eviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20230815094849.53249-3-mengferry@linux.alibaba.comSigned-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>

fs/erofs/super.c

@@ -19,7 +19,6 @@
 #include <trace/events/erofs.h>
 
 static struct kmem_cache *erofs_inode_cachep __read_mostly;
-struct file_system_type erofs_fs_type;
 
 void _erofs_err(struct super_block *sb, const char *func, const char *fmt, ...)
 {