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Enable CPU cluster support on SbsaQemu platform, so that users can specify a 4-level CPU hierarchy sockets/clusters/cores/threads. And this topology can be passed to the firmware through /cpus/topology Device Tree. Signed-off-by: Xiong Yining <xiongyining1480@phytium.com.cn> Reviewed-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org> Reviewed-by: Leif Lindholm <quic_llindhol@quicinc.com> Message-id: 20240607103825.1295328-2-xiongyining1480@phytium.com.cn Tested-by: Marcin Juszkiewicz <marcin.juszkiewicz@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>