[coreboot-gerrit] Change in coreboot[master]: abuild: give --silent the silent treatment

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Change subject: abuild: give --silent the silent treatment
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Patch Set 1: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-gerrit/56299/ : SUCCESS

https://qa.coreboot.org/job/coreboot-checkpatch/11894/ : SUCCESS