mainboard: Convert #ifdef to IS_ENABLED in get_bus_conf.c

Change-Id: I254e9e9e65519edcf4d3f1ecc385af16d18c2367
Signed-off-by: Timothy Pearson <tpearson@raptorengineeringinc.com>
Reviewed-on: http://review.coreboot.org/12208
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Martin Roth <martinroth@google.com>
Reviewed-by: Patrick Georgi <pgeorgi@google.com>
diff --git a/src/mainboard/siemens/sitemp_g1p1/get_bus_conf.c b/src/mainboard/siemens/sitemp_g1p1/get_bus_conf.c
index d35083c..992f306 100644
--- a/src/mainboard/siemens/sitemp_g1p1/get_bus_conf.c
+++ b/src/mainboard/siemens/sitemp_g1p1/get_bus_conf.c
@@ -23,9 +23,7 @@
 #include <string.h>
 #include <stdint.h>
 #include <stdlib.h>
-#if CONFIG_LOGICAL_CPUS
 #include <cpu/amd/multicore.h>
-#endif
 
 #include <cpu/amd/amdk8_sysconf.h>
 
@@ -107,10 +105,9 @@
 	}
 
 	/* I/O APICs:   APIC ID Version State   Address */
-#if CONFIG_LOGICAL_CPUS
-	apicid_base = get_apicid_base(1);
-#else
-	apicid_base = CONFIG_MAX_PHYSICAL_CPUS;
-#endif
+	if (IS_ENABLED(CONFIG_LOGICAL_CPUS))
+		apicid_base = get_apicid_base(1);
+	else
+		apicid_base = CONFIG_MAX_PHYSICAL_CPUS;
 	apicid_sb600 = apicid_base + 0;
 }