tools: Drop conflicting non-atomic test_and_{clear,set}_bit() helpers

Drop tools' non-atomic test_and_set_bit() and test_and_clear_bit() helpers
now that all users are gone.  The names will be claimed in the future for
atomic versions.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20221119013450.2643007-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>