(虚拟化kvm)Enable Intel CascadeLake and CooperLake CPU support on 20.03-LTS-SP2 Update

(虚拟化kvm)Enable Intel CascadeLake and CooperLake CPU support, backport related patches from upstream according to Intel's suggestion.

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openEuler-1.0-LTS

bbea3a3a6804 KVM: x86: expose AVX512_BF16 feature to guest
16b22d7314f3 KVM: cpuid: remove has_leaf_count from struct kvm_cpuid_param
a61f03dae1a1 KVM: cpuid: rename do_cpuid_1_ent
ad2a90fb2c3b KVM: cpuid: set struct kvm_cpuid_entry2 flags in do_cpuid_1_ent
18f2e790a558 KVM: cpuid: extract do_cpuid_7_mask and support multiple subleafs
b2c1c889c821 KVM: cpuid: do_cpuid_ent works on a whole CPUID function
``

kernel-4.19 
```cpp
8730841a1a52 KVM: x86: expose AVX512_BF16 feature to guest
9f233a38b5d3 KVM: cpuid: remove has_leaf_count from struct kvm_cpuid_param
fb2f18f431ce KVM: cpuid: rename do_cpuid_1_ent
cd4be7476ba3 KVM: cpuid: set struct kvm_cpuid_entry2 flags in do_cpuid_1_ent
0842ebd9a8a0 KVM: cpuid: extract do_cpuid_7_mask and support multiple subleafs
c9558466afba KVM: cpuid: do_cpuid_ent works on a whole CPUID function

GVP openEuler/kernel

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GVPopenEuler/kernel

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