power: Convert to DEFINE_SHOW_ATTRIBUTE

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.
Signed-off-by: Yongqiang Liu <liuyongqiang13@huawei.com>
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

drivers/power/supply/da9030_battery.c

@@ -172,17 +172,7 @@ static int bat_debug_show(struct seq_file *s, void *data)
 	return 0;
 }
 
-static int debug_open(struct inode *inode, struct file *file)
-{
-	return single_open(file, bat_debug_show, inode->i_private);
-}
-
-static const struct file_operations bat_debug_fops = {
-	.open		= debug_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(bat_debug);
 
 static struct dentry *da9030_bat_create_debugfs(struct da9030_charger *charger)
 {