cpu/x86/Kconfig*: Guard with ARCH_X86

None of these options make sense on different ARCH.

Change-Id: Ie90ad24ff9013e38c42f10285cc3b546a3cc0571
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63673
Reviewed-by: Felix Singer <felixsinger@posteo.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/src/cpu/x86/Kconfig b/src/cpu/x86/Kconfig
index d5c688d..658d2aa 100644
--- a/src/cpu/x86/Kconfig
+++ b/src/cpu/x86/Kconfig
@@ -1,3 +1,5 @@
+if ARCH_X86
+
 config PARALLEL_MP
 	def_bool y
 	depends on !LEGACY_SMP_INIT
@@ -194,3 +196,5 @@
 	  Enables the new method of locating struct cpu_info. This new method
 	  uses the %gs segment to locate the cpu_info pointer. The old method
 	  relied on the stack being CONFIG_STACK_SIZE aligned.
+
+endif # ARCH_X86