Change in coreboot[master]: clang: Enable integrated assembler on clang builds

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Change subject: clang: Enable integrated assembler on clang builds
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Patch Set 3: Verified+1

Build Successful

https://qa.coreboot.org/job/coreboot-checkpatch/14907/ : SUCCESS

https://qa.coreboot.org/job/coreboot-gerrit/59625/ : SUCCESS