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/x86/lib/bootm.c b/arch/x86/lib/bootm.c
index 04e475b..873e2bc 100644
--- a/arch/x86/lib/bootm.c
+++ b/arch/x86/lib/bootm.c
@@ -78,7 +78,7 @@
 	size_t len;
 	int ret;
 
-	if (CONFIG_IS_ENABLED(OF_LIBFDT) && CONFIG_IS_ENABLED(LMB) && images->ft_len) {
+	if (CONFIG_IS_ENABLED(OF_LIBFDT) && IS_ENABLED(CONFIG_LMB) && images->ft_len) {
 		debug("using: FDT\n");
 		if (image_setup_linux(images)) {
 			puts("FDT creation failed! hanging...");