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/x86/lib/bootm.c b/arch/x86/lib/bootm.c
index eafcddf..04e475b 100644
--- a/arch/x86/lib/bootm.c
+++ b/arch/x86/lib/bootm.c
@@ -39,7 +39,7 @@
 	timestamp_add_now(TS_START_KERNEL);
 #endif
 	bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
-#if CONFIG_IS_ENABLED(BOOTSTAGE_REPORT)
+#if IS_ENABLED(CONFIG_BOOTSTAGE_REPORT)
 	bootstage_report();
 #endif