Change in coreboot[master]: mb/emulation/q35: Fix running with qemu-i386 with SMM_TSEG

[Kyösti Mälkki (Code Review)]

Attention is currently required from: Arthur Heymans.
Kyösti Mälkki has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55138 )

Change subject: mb/emulation/q35: Fix running with qemu-i386 with SMM_TSEG
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Patch Set 4:

(2 comments)

File src/mainboard/emulation/qemu-q35/cpu.c:

https://review.coreboot.org/c/coreboot/+/55138/comment/4a912c09_16ad560a 
PS4, Line 50: 	const u32 revision = save_state->amd64.smm_revision;
nit: Supposedly legacy existed first, so it sort of defined where the revision field has to be located.

https://review.coreboot.org/c/coreboot/+/55138/comment/9ae2abab_58e36181 
PS4, Line 52: 	case 0x00020000:
ASEG SMM code tests for 0x00030002 and 0x00030007 for legacy state?

Perhaps !PARALLEL_MP SMI handler does not work with qemu-system-i386?