Remove the secondary execution controls cache now that it's effectively
dead code; it is only read immediately after it is written.

No functional change intended.
Signed-off-by: NSean Christopherson <seanjc@google.com>
Message-Id: <20210810171952.2758100-4-seanjc@google.com>
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>