memory: tegra186-emc: Use DEFINE_SHOW_ATTRIBUTE to simplify code

Use DEFINE_SHOW_ATTRIBUTE helper macro to simplify the code. No
functional change.
Signed-off-by: Liu Shixin <liushixin2@huawei.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/memory/tegra/tegra186-emc.c

@@ -84,20 +84,7 @@ static int tegra186_emc_debug_available_rates_show(struct seq_file *s,
 
 	return 0;
 }
-
-static int tegra186_emc_debug_available_rates_open(struct inode *inode,
-						   struct file *file)
-{
-	return single_open(file, tegra186_emc_debug_available_rates_show,
-			   inode->i_private);
-}
-
-static const struct file_operations tegra186_emc_debug_available_rates_fops = {
-	.open = tegra186_emc_debug_available_rates_open,
-	.read = seq_read,
-	.llseek = seq_lseek,
-	.release = single_release,
-};
+DEFINE_SHOW_ATTRIBUTE(tegra186_emc_debug_available_rates);
 
 static int tegra186_emc_debug_min_rate_get(void *data, u64 *rate)
 {