5750149 cpu: Move check for NULL CPU model inside the driver

Authored and Committed by Andrea Bolognani 8 years ago
    cpu: Move check for NULL CPU model inside the driver
    
    While the check is appropriate for eg. the x86 and generic drivers,
    there are some valid ppc64 guest configurations where the CPU
    model is supposed to be NULL.
    
    Moving this check from the generic code to the drivers makes it
    possible to accomodate both use cases.
    
    Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1251927
    
        
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