sw64: add CONFIG_SCHEDSTATS=y to defconfig

Sunway inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I56OLG



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Enable this option to get schedule information for kvm.

Signed-off-by: Deng Xiaoyun <dengxiaoyun@wxiat.com>
Reviewed-by: He Sheng <hesheng@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>