Deduplicate strings when creating the cold image.
Deduplicate strings when creating the cold image.

This saves about 250KiB by eliminating redundant strings in the PCI
name table.

AugustusHuang/Mezzano,AugustusHuang/Mezzano,froggey/Mezzano,varjagg/Mezzano,rvedam/Mezzano,rvedam/Mezzano,varjagg/Mezzano,froggey/Mezzano