PCI: Add defines for PCIe Max_Read_Request_Size
There are a few drivers using magic numbers when operating with PCIe capabilities and PCI_EXP_DEVCTL_READRQ. Define known values to allow cleaning their code a bit. Signed-off-by: NRafał Miłecki <zajec5@gmail.com> Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
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