Use platform consts (#5508)

esphome/components/internal_temperature/sensor.py

@@ -12,6 +12,8 @@ from esphome.const import (
     ENTITY_CATEGORY_DIAGNOSTIC,
     KEY_CORE,
     KEY_FRAMEWORK_VERSION,
+    PLATFORM_ESP32,
+    PLATFORM_RP2040,
 )
 from esphome.core import CORE
 
@@ -49,7 +51,7 @@ CONFIG_SCHEMA = cv.All(
         state_class=STATE_CLASS_MEASUREMENT,
         entity_category=ENTITY_CATEGORY_DIAGNOSTIC,
     ).extend(cv.polling_component_schema("60s")),
-    cv.only_on(["esp32", "rp2040"]),
+    cv.only_on([PLATFORM_ESP32, PLATFORM_RP2040]),
     validate_config,
 )