config: enable CONFIG_HOTPLUG_SMT for arm64

kunpeng inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I8TAPW


CVE: NA

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Set CONFIG_HOTPLUG_SMT=y in arm64 openeuler_defconfig.

Signed-off-by: Jie Liu <liujie375@h-partners.com>