Correct SPL uses of CPU_MICROBLAZE

This converts 2 usages of this option to the non-SPL form, since there is
no SPL_CPU_MICROBLAZE defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/microblaze/cpu/cpuinfo.c b/arch/microblaze/cpu/cpuinfo.c
index f021f4e..6b15d6c 100644
--- a/arch/microblaze/cpu/cpuinfo.c
+++ b/arch/microblaze/cpu/cpuinfo.c
@@ -8,7 +8,7 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
-#if CONFIG_IS_ENABLED(CPU_MICROBLAZE)
+#if IS_ENABLED(CONFIG_CPU_MICROBLAZE)
 /* These key value are as per MBV field in PVR0 */
 static const struct microblaze_version_map cpu_ver_lookup[] = {
 	{"5.00.a", 0x01},