lmb: Export the lmb data structure

Provide a way to access this data structure so that the meminfo command
can use it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

lib/lmb.c

@@ -887,12 +887,12 @@ int lmb_init(void)
 	return 0;
 }
 
-#if CONFIG_IS_ENABLED(UNIT_TEST)
 struct lmb *lmb_get(void)
 {
 	return &lmb;
 }
 
+#if CONFIG_IS_ENABLED(UNIT_TEST)
 int lmb_push(struct lmb *store)
 {
 	int ret;