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Enable fully preemptible kernel (low-latency desktop) configuration for Home Assistant. Home Assistant can be considered as a soft real-time system, where a lower latency is preferred over throughput. A few tests using the rt_test development add-on didn't show measurable improvements, but this could be due to rather synthetic test. Currently some platform use voluntary preemptible kernel, and some fully preemptible. So besides improving latency, this also aims to synchronize the settings across all platforms. Also make sure that debugging is not enable as it can have high runtime overhead according to Kconfig.