Add service icons to HDMI CEC (#113304)

* Add service icons to HDMI CEC

* Update homeassistant/components/hdmi_cec/icons.json

Co-authored-by: Jan Bouwhuis <jbouwh@users.noreply.github.com>

---------

Co-authored-by: Jan Bouwhuis <jbouwh@users.noreply.github.com>

homeassistant/components/hdmi_cec/icons.json

@@ -0,0 +1,10 @@
+{
+  "services": {
+    "power_on": "mdi:power",
+    "select_device": "mdi:television",
+    "send_command": "mdi:console",
+    "standby": "mdi:power-standby",
+    "update": "mdi:update",
+    "volume": "mdi:volume-high"
+  }
+}