target-i386: Set custom features/properties without intermediate x86_def_t

Move custom features parsing after built-in cpu_model defaults are set
and set custom features directly on CPU instance. That allows to make a
clear distinction between built-in cpu model defaults that eventually
should go into class_init() and extra property setting which is done
after defaults are set on CPU instance.

Impl. details:
 * use object_property_parse() property setter so it would be a mechanical
   change to switch to global properties later.
 * And after all current features/properties are converted into static
   properties, it will take a trivial patch to switch to global properties.
   Which will allow to:
   * get CPU instance initialized with all parameters passed on -cpu ...
     cmd. line from object_new() call.
   * call cpu_model/featurestr parsing only once before CPUs are created
   * open a road for removing CPUxxxState.cpu_model_str field, when other
     CPUs are similarly converted to subclasses and static properties.
 - re-factor error handling, to use Error instead of fprintf()s, since
   it is anyway passed in for property setter.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Andreas Färber <afaerber@suse.de>

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