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/include/asm/cpuinfo.h b/arch/microblaze/include/asm/cpuinfo.h
index 86d2c8a..3c58e52 100644
--- a/arch/microblaze/include/asm/cpuinfo.h
+++ b/arch/microblaze/include/asm/cpuinfo.h
@@ -26,7 +26,7 @@
 	u32 dcache_size;
 	u32 dcache_line_length;
 
-#if CONFIG_IS_ENABLED(CPU_MICROBLAZE)
+#if IS_ENABLED(CONFIG_CPU_MICROBLAZE)
 	u32 use_mmu;
 	u32 cpu_freq;
 	u32 addr_size;