KVM: x86: Move kvm_ops_static_call_update() to x86.c

The kvm_ops_static_call_update() is defined in kvm_host.h. That's
completely unnecessary, it should have exactly one caller,
kvm_arch_hardware_setup().  Move the helper to x86.c and have it do the
actual memcpy() of the ops in addition to the static call updates.  This
will also allow for cleanly giving kvm_pmu_ops static_call treatment.

Suggested-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Like Xu <likexu@tencent.com>
[sean: Move memcpy() into the helper and rename accordingly]
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220329235054.3534728-2-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>