KVM: x86: Extract VMX's unhandleable emulation check to common x86

Expose VMX's check for unhandleable emulation as its own kvm_x86_ops hook,
and move the actual pre-KVM_RUN check into common x86.  This will allow
sharing the core logic with KVM's RSM emulation without needed to add a
post-RSM hook, and is a step towards removing the .vcpu_pre_run() hook
entirely.

Alternatively, KVM could provide a post-RSM hook as mentioned, but pre/post
hooks tend to be unwieldy as the exact "timing" of the call often matters
greatly.  E.g. in this case, the call must slot in exactly between loading
guest state from SMRAM and the hack to force the vCPU out of L2 on SHUTDOWN.

Link: https://patch.msgid.link/20260731173340.2644656-2-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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