Move ALLOC_CACHE_ALIGN_BUFFER() to the new memalign.h header

Now that we have a new header file for cache-aligned allocation, we should
move the stack-based allocation macro there also.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/disk/part_efi.c b/disk/part_efi.c
index 5856f93..15627f2 100644
--- a/disk/part_efi.c
+++ b/disk/part_efi.c
@@ -16,6 +16,7 @@
 #include <ide.h>
 #include <inttypes.h>
 #include <malloc.h>
+#include <memalign.h>
 #include <part_efi.h>
 #include <linux/ctype.h>