[S] Change in coreboot[main]: arch/x86/c_start: Drop switching the code selector

[Shuo Liu (Code Review)]

Attention is currently required from: Jérémy Compostella, Patrick Rudolph.

Shuo Liu has posted comments on this change by Patrick Rudolph. ( https://review.coreboot.org/c/coreboot/+/87256?usp=email )

Change subject: arch/x86/c_start: Drop switching the code selector
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Patch Set 4:

(1 comment)

Patchset:

PS4: 
Maybe keeping the switches helps the code robustness. Since there is still lgdt, so the following switching seems natural.