Correct SPL uses of BOOTSTAGE_REPORT

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

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/mips/lib/bootm.c b/arch/mips/lib/bootm.c
index 5687ff2..ab92bd0 100644
--- a/arch/mips/lib/bootm.c
+++ b/arch/mips/lib/bootm.c
@@ -287,7 +287,7 @@
 #if IS_ENABLED(CONFIG_BOOTSTAGE_FDT)
 	bootstage_fdt_add_report();
 #endif
-#if CONFIG_IS_ENABLED(BOOTSTAGE_REPORT)
+#if IS_ENABLED(CONFIG_BOOTSTAGE_REPORT)
 	bootstage_report();
 #endif