[S] Change in coreboot[master]: soc/intel/xeon_sp/chip_common.c: check SOC_INTEL_PCIE_64BIT_ALLOC

[Johnny Lin (Code Review)]

Attention is currently required from: Jonathan Zhang, David Hendricks, Christian Walter, Arthur Heymans, Elyes Haouas, Tim Chu.

Johnny Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/72441 )

Change subject: soc/intel/xeon_sp/chip_common.c: check SOC_INTEL_PCIE_64BIT_ALLOC
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Patch Set 6:

(1 comment)

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

https://review.coreboot.org/c/coreboot/+/72441/comment/d63ee06c_03bfd127 
PS6, Line 410: #if
> why "#if"? […]

line 414 PlatformData.Pci64BitResourceAllocation may not be defined by platforms selecting SOC_INTEL_PCIE_64BIT_ALLOC, by using C will see build error:
src/soc/intel/xeon_sp/chip_common.c:414:33: error: 'PLATFORM_DATA' has no member named 'Pci64BitResourceAllocation'
  414 |         return hob->PlatformData.Pci64BitResourceAllocation;

So C preprocessor is needed.