KVM: VMX: Move CPU_BASED_CR8_{LOAD,STORE}_EXITING filtering out of setup_vmcs_config()

KVM: VMX: Move CPU_BASED_CR8_{LOAD,STORE}_EXITING filtering out of setup_vmcs_config()

As a preparation to reusing the result of setup_vmcs_config() in
nested VMX MSR setup, move CPU_BASED_CR8_{LOAD,STORE}_EXITING filtering
to vmx_exec_control().

No functional change intended.

Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220830133737.1539624-25-vkuznets@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>