Rename the kvm_x86_ops hook for exception injection to better reflect
reality, and to align with pretty much every other related function name
in KVM.

No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Link: https://lore.kernel.org/r/20220830231614.3580124-14-seanjc@google.comSigned-off-by: Paolo Bonzini <pbonzini@redhat.com>