ARM64: dump: Convert to use DEFINE_SHOW_ATTRIBUTE macro

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.
Signed-off-by: NPeng Donglin <dolinux.peng@gmail.com>
Signed-off-by: NWill Deacon <will.deacon@arm.com>

arch/arm64/mm/ptdump_debugfs.c

@@ -10,18 +10,7 @@ static int ptdump_show(struct seq_file *m, void *v)
 	ptdump_walk_pgd(m, info);
 	return 0;
 }
-
-static int ptdump_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, ptdump_show, inode->i_private);
-}
-
-static const struct file_operations ptdump_fops = {
-	.open		= ptdump_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(ptdump);
 
 int ptdump_debugfs_register(struct ptdump_info *info, const char *name)
 {