i386: remove the 'INTEL_PT' CPUID bit from named CPU models

i386: remove the 'INTEL_PT' CPUID bit from named CPU models

Processor tracing is not yet implemented for KVM and it will be an
opt in feature requiring a special module parameter.
Disable it, because it is wrong to enable it by default and
it is impossible that no one has ever used it.

Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit 4c257911dcc7c4189768e9651755c849ce9db4e8)
*drop context dependency on ecb85fe48
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>