mb/emulation/qemu: Fix SMP boot

Fix booting with SMP enabled, when specifying more CPUs than supported
by the code.

Change-Id: Ib3d7c1a1a7a8633d4d434ccbd46cf92b0074b724
Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/50235
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
diff --git a/src/cpu/qemu-x86/Kconfig b/src/cpu/qemu-x86/Kconfig
index 641cea8..a22d7f9 100644
--- a/src/cpu/qemu-x86/Kconfig
+++ b/src/cpu/qemu-x86/Kconfig
@@ -44,8 +44,8 @@
 
 config MAX_CPUS
 	int
-	default 4 if SMM_ASEG
-	default 32
+	default 32 if SMM_TSEG
+	default 4
 
 config CPU_QEMU_X86_64
 	bool "Experimental 64bit support"