Change in coreboot[master]: soc/amd/cezanne: Separate signed amdfw

[Paul Menzel (Code Review)]

Attention is currently required from: Jason Glenesk, Raul Rangel, Marshall Dawson, Kangheui Won, Karthik Ramasubramanian, Felix Held.
Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/59867 )

Change subject: soc/amd/cezanne: Separate signed amdfw
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Patch Set 3:

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/59867/comment/821c4708_12119b9a 
PS2, Line 13: which means
            : faster boot time
> I've removed mainboard part here and working on other patches before we enable feature for specific  […]

Ack

Commit Message:

https://review.coreboot.org/c/coreboot/+/59867/comment/606262e9_8920c160 
PS3, Line 7: Separate signed amdfw
Maybe use:
> Move signed amdfw from FW_MAIN into SIGNED_AMDFW