KVM: x86: WARN if MOV DR emulation hits a "too late" #GP

WARN if ->set_dr() => kvm_set_dr() fails when emulating a MOV DR write,
as the emulator _must_ pre-check for #GPs in order to get the event
priority right when emulating MOV DR for L2 on SVM (all exceptions have
higher priority than the instruction intercept).

Opportunistically update the comment as the blurb about "#UD" being
checked is incomplete and misleading.

Reviewed-by: Jim Mattson <jmattson@google.com>
Link: https://patch.msgid.link/20260612230113.684301-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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