To realize CPU hotplug, the cpus aml within ACPI DSDT should contain _MAT mathod, which is equal to the GICC struct in ACPI MADT. Factor out the GICC building code from ACPI MADT and reuse it in build_cpus_aml. Signed-off-by: Keqian Zhu <zhukeqian1@huawei.com> Signed-off-by: Salil Mehta <salil.mehta@huawei.com> (cherry picked from commit f2b68e8adc98f8db20b1edc84b8f485975ed987c)
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