Settle on a common prefix to ESP-specific entities

esp is often used as a bridge to other device, e.g. a lock,
an AC, a siren, power switch etc. It helps to distinguish esp chip
sensor readings from that of the target device

templates/esp32-poe.yaml

@@ -16,9 +16,9 @@ ethernet:
 text_sensor:
 - platform: ethernet_info
   ip_address:
-    name: "Device IP (Ethernet)"
+    name: "ESP chip IP (Ethernet)"
   mac_address:
-    name: "Device MAC (Ethernet)"
+    name: "ESP chip MAC (Ethernet)"
 
 logger: