Added support for device_class property on media_player devices

_LOGGER = logging.getLogger(__name__)

DEFAULT_NAME = "SmartIR Media Player"

DEFAULT_DEVICE_CLASS = "tv"

CONF_UNIQUE_ID = 'unique_id'

CONF_DEVICE_CODE = 'device_code'

CONF_CONTROLLER_DATA = "controller_data"

CONF_POWER_SENSOR = 'power_sensor'

CONF_SOURCE_NAMES = 'source_names'

CONF_DEVICE_CLASS = 'device_class'

PLATFORM_SCHEMA = PLATFORM_SCHEMA.extend({

    vol.Optional(CONF_UNIQUE_ID): cv.string,

    vol.Required(CONF_DEVICE_CODE): cv.positive_int,

    vol.Required(CONF_CONTROLLER_DATA): cv.string,

    vol.Optional(CONF_POWER_SENSOR): cv.entity_id,

    vol.Optional(CONF_SOURCE_NAMES): dict

    vol.Optional(CONF_SOURCE_NAMES): dict,

    vol.Optional(CONF_DEVICE_CLASS, default=DEFAULT_DEVICE_CLASS): cv.string

})

async def async_setup_platform(hass, config, async_add_entities, discovery_info=None):

        self._source = None

        self._support_flags = 0

        self._device_class = config.get(CONF_DEVICE_CLASS)

        #Supported features

        if 'off' in self._commands and self._commands['off'] is not None:

            self._support_flags = self._support_flags | SUPPORT_TURN_OFF

        """Return the name of the media player."""

        return self._name

    @property

    def device_class(self):

        """Return the device_class of the media player."""

        return self._device_class

    @property

    def state(self):

        """Return the state of the player."""