leds-lp55xx: clean up init function

 lp5521/5523_init_device() are replaced with lp55xx common function,
 lp55xx_init_device().

 Error handler in init_device:
 deinit function are matched with 'err_post_init' section in
 lp55xx_init_device().

 Remove LP5523 engine intialization code:
 Engine functionality is not mandatory but optional.
 Moreover engine initialization is done internally with device reset command.
 Therefore, this code is unnecessary.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@ti.com>
Signed-off-by: Bryan Wu <cooloney@gmail.com>
diff --git a/drivers/leds/leds-lp5521.c b/drivers/leds/leds-lp5521.c
index faab449..74dc208 100644
--- a/drivers/leds/leds-lp5521.c
+++ b/drivers/leds/leds-lp5521.c
@@ -689,26 +689,6 @@
 				&lp5521_led_attribute_group);
 }
 
-static void lp5521_deinit_device(struct lp5521_chip *chip);
-static int lp5521_init_device(struct lp5521_chip *chip)
-{
-	struct i2c_client *client = chip->client;
-	struct lp55xx_chip *temp;
-	int ret;
-
-	ret = lp5521_post_init_device(temp);
-	if (ret < 0) {
-		dev_err(&client->dev, "error configuring chip\n");
-		goto err_config;
-	}
-
-	return 0;
-
-err_config:
-	lp5521_deinit_device(chip);
-	return ret;
-}
-
 static void lp5521_deinit_device(struct lp5521_chip *chip)
 {
 	struct lp5521_platform_data *pdata = chip->pdata;
@@ -860,7 +840,7 @@
 
 	i2c_set_clientdata(client, led);
 
-	ret = lp5521_init_device(old_chip);
+	ret = lp55xx_init_device(chip);
 	if (ret)
 		goto err_init;