cpu/intel/fsp_model_206ax/model_206ax_init.c: Use macro `IS_ENABLED()`

Change-Id: I91cd84d155a2cb1200cb82c31256cfa743e8ea9b
Signed-off-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-on: http://review.coreboot.org/6227
Tested-by: build bot (Jenkins)
Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
diff --git a/src/cpu/intel/fsp_model_206ax/model_206ax_init.c b/src/cpu/intel/fsp_model_206ax/model_206ax_init.c
index e242e40..d0b2d3d 100644
--- a/src/cpu/intel/fsp_model_206ax/model_206ax_init.c
+++ b/src/cpu/intel/fsp_model_206ax/model_206ax_init.c
@@ -40,7 +40,7 @@
 {
 	struct cpuid_result regs;
 	msr_t msr;
-	int enable = CONFIG_ENABLE_VMX;
+	int enable = IS_ENABLED(CONFIG_ENABLE_VMX);
 
 	regs = cpuid(1);
 	/* Check that the VMX is supported before reading or writing the MSR. */