[S] Change in coreboot[master]: soc/amd/common/block: Add missing cbfs_unmap().

[Konrad Adamczyk (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Matt DeVillier, Grzegorz Bernacki, Tim Van Patten, Fred Reitberger, Karthik Ramasubramanian, Felix Held.

Konrad Adamczyk has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74716 )

Change subject: soc/amd/common/block: Add missing cbfs_unmap().
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Patch Set 1:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/74716/comment/4a036eb3_7a7b7a55 
PS1, Line 15: 
missing `Signed-off-by` tag.

File src/soc/amd/common/block/graphics/graphics.c:

https://review.coreboot.org/c/coreboot/+/74716/comment/7a814a2f_891321fe 
PS1, Line 173: 	cbfs_unmap(rom);
What do you think about introducing `pci_rom_free` at `src/device/pci_rom.c` and call it here instead of pure `cbfs_unmap` to keep the API consistent?

I believe it might be confusing to use `cbfs_unmap` - we're relying on current  implementation of `pci_rom_probe` function itself (is using `cbfs_map` right now, but that might change).