drm/komeda: Convert to DEFINE_SHOW_ATTRIBUTE

Use DEFINE_SHOW_ATTRIBUTE macro to simplify the code.
Signed-off-by: Qinglang Miao <miaoqinglang@huawei.com>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Tested-by: Carsten Haitzler <carsten.haitzler@foss.arm.com>
Signed-off-by: Liviu Dudau <liviu.dudau@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200917123949.101925-1-miaoqinglang@huawei.com

drivers/gpu/drm/arm/display/komeda/komeda_dev.c

@@ -41,18 +41,7 @@ static int komeda_register_show(struct seq_file *sf, void *x)
 	return 0;
 }
 
-static int komeda_register_open(struct inode *inode, struct file *filp)
-{
-	return single_open(filp, komeda_register_show, inode->i_private);
-}
-
-static const struct file_operations komeda_register_fops = {
-	.owner		= THIS_MODULE,
-	.open		= komeda_register_open,
-	.read		= seq_read,
-	.llseek		= seq_lseek,
-	.release	= single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(komeda_register);
 
 #ifdef CONFIG_DEBUG_FS
 static void komeda_debugfs_init(struct komeda_dev *mdev)