LoongArch: KVM: Check interrupt route from physical CPU

LoongArch: KVM: Check interrupt route from physical CPU

With EIOINTC interrupt controller, physical CPU ID is set for irq route.
However the function kvm_get_vcpu() is used to get destination vCPU when
delivering irq. With API kvm_get_vcpu(), the logical CPU ID is used.

With API kvm_get_vcpu_by_cpuid(), vCPU ID can be searched from physical
CPU ID.

Cc: stable@vger.kernel.org
Fixes: 3956a52bc05b ("LoongArch: KVM: Add EIOINTC read and write functions")
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>