Enable dhcp flows for steamist registered devices (#66593)

homeassistant/components/steamist/manifest.json

@@ -8,6 +8,7 @@
   "codeowners": ["@bdraco"],
   "iot_class": "local_polling",
   "dhcp": [
+    {"registered_devices": true},
     {
       "macaddress": "001E0C*",
       "hostname": "my[45]50*"

homeassistant/generated/dhcp.py

@@ -87,6 +87,7 @@ DHCP: list[dict[str, str | bool]] = [
     {'domain': 'solaredge', 'hostname': 'target', 'macaddress': '002702*'},
     {'domain': 'somfy_mylink', 'hostname': 'somfy_*', 'macaddress': 'B8B7F1*'},
     {'domain': 'squeezebox', 'hostname': 'squeezebox*', 'macaddress': '000420*'},
+    {'domain': 'steamist', 'registered_devices': True},
     {'domain': 'steamist', 'hostname': 'my[45]50*', 'macaddress': '001E0C*'},
     {'domain': 'tado', 'hostname': 'tado*'},
     {'domain': 'tesla_wall_connector',