Add domain icon for time and datetime (#16710)

src/common/const.ts

@@ -83,6 +83,7 @@ export const FIXED_DOMAIN_ICONS = {
   configurator: mdiCog,
   conversation: mdiMicrophoneMessage,
   counter: mdiCounter,
+  datetime: mdiCalendarClock,
   date: mdiCalendar,
   demo: mdiHomeAssistant,
   google_assistant: mdiGoogleAssistant,
@@ -112,6 +113,7 @@ export const FIXED_DOMAIN_ICONS = {
   siren: mdiBullhorn,
   stt: mdiMicrophoneMessage,
   text: mdiFormTextbox,
+  time: mdiClock,
   timer: mdiTimerOutline,
   tts: mdiSpeakerMessage,
   updater: mdiCloudUpload,