Change in coreboot[master]: pciexp_device: Remove useless write on a read-only register

[build bot (Jenkins) (Code Review)]

build bot (Jenkins) has posted comments on this change. ( https://review.coreboot.org/19901 )

Change subject: pciexp_device: Remove useless write on a read-only register
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Patch Set 1: Verified-1

Build Failed

https://qa.coreboot.org/job/coreboot-gerrit/54324/ : ABORTED

https://qa.coreboot.org/job/coreboot-checkpatch/10053/ : SUCCESS