Change in coreboot[master]: soc/amd: Throw an error if ROM size is invalid

[Bao Zheng (Code Review)]

Attention is currently required from: Jason Glenesk, Martin Roth, Marshall Dawson, Zheng Bao, Felix Held.
Bao Zheng has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49855 )

Change subject: soc/amd: Throw an error if ROM size is invalid
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Patch Set 6:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/49855/comment/c7a22060_57fccf0f 
PS5, Line 10: string causes an undetectable build error.
> it's not about boards not setting FWM_POSITION_INDEX, but mostly about boards not setting a valid ro […]

Done

File src/soc/amd/cezanne/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/49855/comment/0022c347_880f964d 
PS5, Line 44: Invalid AMD firmware position index
> i'd add to the error message that the board doesn't provide a valid rom size, since that is the most […]

Done