[S] Change in coreboot[master]: soc/intel/xeon_sp: Fix very small total memory when CXL is enabled

[Patrick Rudolph (Code Review)]

Attention is currently required from: Jonathan Zhang, Paul Menzel, Jingle Hsu, David Hendricks, Nill Ge, Arthur Heymans, TangYiwei, Johnny Lin, Christian Walter, Shuo Liu, Lean Sheng Tan, Shelly Chang, Tim Chu.

Patrick Rudolph has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/74296 )

Change subject: soc/intel/xeon_sp: Fix very small total memory when CXL is enabled
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Patch Set 2:

(2 comments)

File src/soc/intel/xeon_sp/uncore.c:

https://review.coreboot.org/c/coreboot/+/74296/comment/6e2a6854_d13c329a 
PS2, Line 260: ram_from_to
use upper_ram_end()?

https://review.coreboot.org/c/coreboot/+/74296/comment/6cb6a18b_9f7c4d48 
PS2, Line 261: gi_mem_size
why is gi_mem_size subtracted in the !CONFIG(OCP_VPD) case?
The call to fixed_mem_range_flags() below would not be executed, thus you would advertise less RAM than actually available?