KVM: nVMX: Use CC() macro to handle eVMCS unsupported controls checks

Locally #define and use the nested virtualization Consistency Check (CC)
macro to handle eVMCS unsupported controls checks.  Using the macro loses
the existing printing of the unsupported controls, but that's a feature
and not a bug.  The existing approach is flawed because the @err param to
trace_kvm_nested_vmenter_failed() is the error code, not the error value.

The eVMCS trickery mostly works as __print_symbolic() falls back to
printing the raw hex value, but that subtly relies on not having a match
between the unsupported value and VMX_VMENTER_INSTRUCTION_ERRORS.

If it's really truly necessary to snapshot the bad value, then the
tracepoint can be extended in the future.

Signed-off-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/20220830133737.1539624-9-vkuznets@redhat.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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