i386/cpu: Remove AVX_VNNI feature from Cooperlake cpu model

i386/cpu: Remove AVX_VNNI feature from Cooperlake cpu model

The AVX_VNNI feature is not in Cooperlake platform, remove it
from cpu model.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20210820054611.84303-1-yang.zhong@intel.com>
Fixes: c1826ea6a052 ("i386/cpu: Expose AVX_VNNI instruction to guest")
Cc: qemu-stable@nongnu.org
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
(cherry picked from commit f429dbf8fc526a9cacf531176b28d0c65701475a)
Signed-off-by: Michael Roth <michael.roth@amd.com>