i386/cpu: Add CPU model for Diamond Rapids

i386/cpu: Add CPU model for Diamond Rapids

According to table 1-2 in Intel Architecture Instruction Set Extensions
and Future Features (rev 059), Diamond Rapids has the following new
features which have already been supported for guest:
 * SM4 (EVEX)
 * Intel Advanced Vector Extensions 10 Version 2 (Intel AVX10.2)
 * MOVRS and the PREFETCHRST2 instruction
 * AMX-MOVRS, AMX-AVX512, AMX-FP8, AMX-TF32
 * Intel Advanced Performance Extensions

And FRED - Flexible Return and Event Delivery (FRED) and the LKGS
instruction (introduced since Clearwater Forest & Diamond Rapids) - is
included in Diamond Rapids CPU model.

In addition, the following features are added into Diamond Rapids CPU
model:
 * CET: Control-flow Enforcement Technology (introduced since Sapphire
   Rapids & Sierra Forest).

Tested-by: Xudong Hao <xudong.hao@intel.com>
Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20251215073743.4055227-11-zhao1.liu@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>