Change in coreboot[master]: intel/xeon_sp/util: Use get_stack_busnos instead get_cpubusnos

[Angel Pons (Code Review)]

Attention is currently required from: Marc Jones, Maxim Polyakov, Patrick Rudolph.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/49458 )

Change subject: intel/xeon_sp/util: Use get_stack_busnos instead get_cpubusnos
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Patch Set 3: Code-Review+1

(2 comments)

Commit Message:

https://review.coreboot.org/c/coreboot/+/49458/comment/525d98d1_d0cd5b9d 
PS3, Line 7: instead
instead *of*

https://review.coreboot.org/c/coreboot/+/49458/comment/f5db8ff9_f0fa3741 
PS3, Line 10: Also replace pci_io_read_config32 with
            : pci_mmio_read_config32 to get the register value before mapping the
            : MMIOCFG space.
Should be done in another commit (the preceding commit, maybe?)