target/i386: Fix cpuid level for AMD

target/i386: Fix cpuid level for AMD

A AMD server typically has cpuid level 0x10(test on Rome/Milan), it
should not be changed to 0x1f in multi-dies case.

* to maintain compatibility with older machine types, only implement
  this change when the CPU's "x-vendor-cpuid-only" property is false

Cc: "Dr. David Alan Gilbert" <[email protected]>
Cc: Eduardo Habkost <[email protected]>
Cc: Richard Henderson <[email protected]>
Cc: Igor Mammedov <[email protected]>
Cc: zhenwei pi <[email protected]>
Fixes: a94e1428991 (target/i386: Add CPUID.1F generation support for multi-dies PCMachine)
Signed-off-by: zhenwei pi <[email protected]>
Signed-off-by: Michael Roth <[email protected]>
Message-Id: <20210708170641[email protected]>
Signed-off-by: Eduardo Habkost <[email protected]>