Use core constants for nad (#49709)

homeassistant/components/nad/media_player.py

@@ -11,7 +11,14 @@ from homeassistant.components.media_player.const import (
     SUPPORT_VOLUME_SET,
     SUPPORT_VOLUME_STEP,
 )
-from homeassistant.const import CONF_HOST, CONF_NAME, STATE_OFF, STATE_ON
+from homeassistant.const import (
+    CONF_HOST,
+    CONF_NAME,
+    CONF_PORT,
+    CONF_TYPE,
+    STATE_OFF,
+    STATE_ON,
+)
 import homeassistant.helpers.config_validation as cv
 
 DEFAULT_TYPE = "RS232"
@@ -31,9 +38,7 @@ SUPPORT_NAD = (
     | SUPPORT_SELECT_SOURCE
 )
 
-CONF_TYPE = "type"
 CONF_SERIAL_PORT = "serial_port"  # for NADReceiver
-CONF_PORT = "port"  # for NADReceiverTelnet
 CONF_MIN_VOLUME = "min_volume"
 CONF_MAX_VOLUME = "max_volume"
 CONF_VOLUME_STEP = "volume_step"  # for NADReceiverTCP