qapi: Define PCIe link speed and width properties
Create properties to be able to define speeds and widths for PCIe links. The only tricky bit here is that our get and set callbacks translate from the fixed QAPI automagic enums to those we define in PCI code to represent the actual register segment value. Cc: Eric Blake <eblake@redhat.com> Tested-by: NGeoffrey McRae <geoff@hostfission.com> Reviewed-by: NMarkus Armbruster <armbru@redhat.com> Signed-off-by: NAlex Williamson <alex.williamson@redhat.com> Reviewed-by: NMichael S. Tsirkin <mst@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
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