target/loongarch: Move kvm specified vCPU property to kvm directory

LBT and PMU feature is supported only in kvm mode, move property
about these two features to function kvm_loongarch_cpu_post_init().

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
2 files changed