[XS] Change in coreboot[main]: acpi: Create MADT lapic entries according to current lapic mode

[Arthur Heymans (Code Review)]

Attention is currently required from: Cliff Huang, Jincheng Li, Lance Zhao, Shuo Liu, Tim Wawrzynczak.

Arthur Heymans has posted comments on this change by Shuo Liu. ( https://review.coreboot.org/c/coreboot/+/84324?usp=email )

Change subject: acpi: Create MADT lapic entries according to current lapic mode
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Patch Set 1:

(2 comments)

Patchset:

PS1: 
I'm not sure that the current lapic mode is relevant for passing info to OS.

Maybe always using x2apic if that is available is more reasonable than the current mix.

Commit Message:

https://review.coreboot.org/c/coreboot/+/84324/comment/6e4dd771_b3f1147b?usp... :
PS1, Line 9: Introduce a new function is_x2apic_mode() to tell current lapic
           : mode and create the lapic entries accordingly.
Explain why?