intelligent CLS kills qemu's 8139cp

[Alexey Dobriyan]

After this patch qemu's 8139cp won't be initialized resulting in no network.
It einvals in pci_set_cacheline_size() where pci_cache_line_size=0

PCI: CLS 0 bytes, default 32

ac1aa47b131416a6ff37eb1005a0a1d2541aad6c is first bad commit
commit ac1aa47b131416a6ff37eb1005a0a1d2541aad6c
Author: Jesse Barnes <jbarnes@xxxxxxxxxxxxxxxx>
Date:   Mon Oct 26 13:20:44 2009 -0700

    PCI: determine CLS more intelligently
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