Fix supported_features in MQTT fan (#28680)
Fix supported_features in MQTT fan (#28680)

* Added custom validator function for speed list

* Replace CONF_SPEED_STATE_TOPIC with CONF_SPEED_COMMAND_TOPIC to determine SUPPORT_SET_SPEED

* Revert "Added custom validator function for speed list"

This reverts commit f000396fa642c64bde40513ea70d9915dbd71ead.

* Replace CONF_OSCILLATION_STATE_TOPIC with CONF_OSCILLATION_COMMAND_TOPIC to determine SUPPORT_OSCILLATE

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