Change in coreboot[master]: device/pciexp_device: Set values numerically instead of as bitmask

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Change subject: device/pciexp_device: Set values numerically instead of as bitmask
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/64131/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/18961/ : SUCCESS