[M] Change in coreboot[main]: cpu/x86/mp_init: Add code to restart APs

[Shuo Liu (Code Review)]

Attention is currently required from: Filip Lewiński, Jérémy Compostella, Krystian Hebel, Michał Kopeć, Michał Żygowski, Paul Menzel.

Shuo Liu has posted comments on this change by Filip Lewiński. ( https://review.coreboot.org/c/coreboot/+/82696?usp=email )

Change subject: cpu/x86/mp_init: Add code to restart APs
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Patch Set 12: Code-Review+1

(1 comment)

File src/cpu/x86/mp_init.c:

https://review.coreboot.org/c/coreboot/+/82696/comment/4fa7180e_390600a3?usp... :
PS7, Line 1215: printk(BIOS_DEBUG, "%d/%d eventually checked in?\n",
> @coreboot.org@gmail. […]

Not sure if we can remove the mdelay in both here and mp_init (maybe in a separate patch) since in start_aps, there is already waits for AP to checkin.