Change in coreboot[master]: lib/spd: Do not print part number if it is not available

[Werner Zeh (Code Review)]

Attention is currently required from: Subrata Banik, Paul Menzel, Angel Pons, Arthur Heymans.
Werner Zeh has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62699 )

Change subject: lib/spd: Do not print part number if it is not available
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Patch Set 1:

(1 comment)

File src/lib/spd_bin.c:

https://review.coreboot.org/c/coreboot/+/62699/comment/6cfa7f67_5d62f0af 
PS1, Line 173: 		}
> Print some placeholder as the part number? UNKNOWN or so?

I would rather like to skip this line if there is no part number as there is no additional information that can be gained from an "UNKNOWN".