Consolidate CONF_RAW_DATA_ID to const.py (#2491)

esphome/components/image/__init__.py

@@ -4,7 +4,14 @@ from esphome import core
 from esphome.components import display, font
 import esphome.config_validation as cv
 import esphome.codegen as cg
-from esphome.const import CONF_FILE, CONF_ID, CONF_TYPE, CONF_RESIZE, CONF_DITHER
+from esphome.const import (
+    CONF_DITHER,
+    CONF_FILE,
+    CONF_ID,
+    CONF_RAW_DATA_ID,
+    CONF_RESIZE,
+    CONF_TYPE,
+)
 from esphome.core import CORE, HexInt
 
 _LOGGER = logging.getLogger(__name__)
@@ -21,8 +28,6 @@ IMAGE_TYPE = {
 
 Image_ = display.display_ns.class_("Image")
 
-CONF_RAW_DATA_ID = "raw_data_id"
-
 IMAGE_SCHEMA = cv.Schema(
     {
         cv.Required(CONF_ID): cv.declare_id(Image_),