Change in coreboot[master]: vendorcode/amd/fsp/cezanne: add UPD structs from FSP build

[Marshall Dawson (Code Review)]

Attention is currently required from: Justin Frodsham, Raul Rangel, Felix Held.
Marshall Dawson has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/50242 )

Change subject: vendorcode/amd/fsp/cezanne: add UPD structs from FSP build
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Patch Set 1: Code-Review+2

(1 comment)

File src/vendorcode/amd/fsp/cezanne/FspmUpd.h:

https://review.coreboot.org/c/coreboot/+/50242/comment/804d4f55_f7c5fb94 
PS1, Line 19: 	/** Offset 0x0050**/	uint32_t                    serial_port_baudrate;
            : 	/** Offset 0x0054**/	uint32_t                    serial_port_refclk;
> This is a WIP, if we don't line up the structures, we can't get very far in post. […]

Raul, also FYI that any serial port activity from the FSP will be for debug builds only.  But agree that any reconfiguring would be a problem.