Add validate to components (#1631)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/wifi/__init__.py

@@ -137,7 +137,7 @@ WIFI_NETWORK_STA = WIFI_NETWORK_BASE.extend(
 )
 
 
-def validate(config):
+def _validate(config):
     if CONF_PASSWORD in config and CONF_SSID not in config:
         raise cv.Invalid("Cannot have WiFi password without SSID!")
 
@@ -207,7 +207,7 @@ CONFIG_SCHEMA = cv.All(
             ),
         }
     ),
-    validate,
+    _validate,
 )