KVM: VMX: Tweak the special handling of SECONDARY_EXEC_ENCLS_EXITING in setup_vmcs_config()

SECONDARY_EXEC_ENCLS_EXITING is the only control which is conditionally
added to the 'optional' checklist in setup_vmcs_config() but the special
case can be avoided by always checking for its presence first and filtering
out the result later.

Note: the situation when SECONDARY_EXEC_ENCLS_EXITING is present but
cpu_has_sgx() is false is possible when SGX is "soft-disabled", e.g. if
software writes MCE control MSRs or there's an uncorrectable #MC.

Reviewed-by: Jim Mattson <[email protected]>
Reviewed-by: Maxim Levitsky <[email protected]>
Signed-off-by: Vitaly Kuznetsov <[email protected]>
Signed-off-by: Sean Christopherson <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Paolo Bonzini <[email protected]>

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