Add a simple version of memalign()

This is used when the full malloc() is not available.

Signed-off-by: Simon Glass <sjg@chromium.org>

common/malloc_simple.c

@@ -26,6 +26,20 @@ void *malloc_simple(size_t bytes)
 	return ptr;
 }
 
+void *memalign_simple(size_t align, size_t bytes)
+{
+	ulong addr, new_ptr;
+	void *ptr;
+
+	addr = ALIGN(gd->malloc_base + gd->malloc_ptr, bytes);
+	new_ptr = addr + bytes;
+	if (new_ptr > gd->malloc_limit)
+		return NULL;
+	ptr = map_sysmem(addr, bytes);
+	gd->malloc_ptr = ALIGN(new_ptr, sizeof(new_ptr));
+	return ptr;
+}
+
 #ifdef CONFIG_SYS_MALLOC_SIMPLE
 void *calloc(size_t nmemb, size_t elem_size)
 {