KVM: VMX: Pass XFD_ERR as pseudo-payload when injecting #NM

Pass XFD_ERR via KVM's exception payload mechanism when injecting an #NM
after interception so that XFD_ERR can be propagated to FRED's event_data
field without needing a dedicated field (which would need to be migrated).

For non-FRED vCPUs, this is a glorified NOP as
kvm_deliver_exception_payload() will simply do nothing (which is desirable
and correct).

Signed-off-by: Xin Li (Intel) <xin@zytor.com>
Tested-by: Shan Kang <shan.kang@intel.com>
Link: https://lore.kernel.org/r/20241001050110.3643764-15-xin@zytor.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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