[coreboot-gerrit] Change in coreboot[master]: mb/google/dedede: Create blipper variant

[Tao Xia (Code Review)]

Attention is currently required from: Martin Roth, zanxi chen, Henry Sun, Paul Menzel, Weimin Wu, Karthik Ramasubramanian.
Tao Xia has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/51055 )

Change subject: mb/google/dedede: Create blipper variant
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Patch Set 1: Code-Review+1