pci_generic_config_write32() access size problem

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Hi Rob,

Russell pointed out a problem with 1f94a94f67e1 ("PCI: Add generic config
accessors").  pci_generic_config_write32() does a read/modify/write if the
size is less than 32 bits, so I think we have problem if this is used with
8- or 16-bit registers that contain RW1C bits.  Any thoughts on how we can
fix this?

Bjorn
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