sb,soc/amd,intel: Drop include <cpu/x86/smm.h>

I forgot to remove these in commit 0fe36db154eb ("ACPI: Make FADT
entries for SMI architectural").

Change-Id: Ib1bc1dad6053ddb0454d4510917fd2bcf0901f35
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/74811
Reviewed-by: Matt DeVillier <matt.devillier@amd.corp-partner.google.com>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Felix Held <felix-coreboot@felixheld.de>

src/soc/amd/phoenix/acpi.c

@@ -16,7 +16,6 @@
 #include <arch/smp/mpspec.h>
 #include <console/console.h>
 #include <cpu/amd/cpuid.h>
-#include <cpu/x86/smm.h>
 #include <soc/acpi.h>
 #include <soc/iomap.h>
 #include <types.h>