x86/ia32: don't save registers on audit call

x86/ia32: don't save registers on audit call

This is a followup on (x86/ia32: save and clear registers on syscall.)
where we would save the registers at the start of the system call
and also clear them (r8->15). But the ptrace syscall would do
the same thing (save) which meant we would end up over-writting them
with zeros.

Orabug: 27344012
CVE:CVE-2017-5715

Reviewed-by: Kris Van Hees <kris.van.hees@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Brian Maly <brian.maly@oracle.com>
Signed-off-by: Kirtikar Kashyap <kirtikar.kashyap@oracle.com>