Correct SPL uses of LMB

This converts 9 usages of this option to the non-SPL form, since there is
no SPL_LMB defined in Kconfig

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arc/lib/bootm.c b/arch/arc/lib/bootm.c
index 07b2c15..2dd0034 100644
--- a/arch/arc/lib/bootm.c
+++ b/arch/arc/lib/bootm.c
@@ -29,7 +29,7 @@
 {
 	int ret;
 
-	if (CONFIG_IS_ENABLED(LMB)) {
+	if (IS_ENABLED(CONFIG_LMB)) {
 		ret = image_setup_linux(images);
 		if (ret)
 			return ret;