Change in coreboot[master]: nb/intel/i945: Add a common function to compute TSEG size

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Change subject: nb/intel/i945: Add a common function to compute TSEG size
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Patch Set 7:

Build Unstable

https://qa.coreboot.org/job/coreboot-gerrit/69350/ : UNSTABLE

https://qa.coreboot.org/job/coreboot-checkpatch/23683/ : SUCCESS