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/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index 1117fed..a84c1e1 100644
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -10,6 +10,7 @@
 #include <common.h>
 #include <errno.h>
 #include <malloc.h>
+#include <memalign.h>
 #include <mmc.h>
 #include <dwmmc.h>
 #include <asm-generic/errno.h>
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c
index 371c1ec..2a58702 100644
--- a/drivers/mmc/mmc.c
+++ b/drivers/mmc/mmc.c
@@ -16,6 +16,7 @@
 #include <mmc.h>
 #include <part.h>
 #include <malloc.h>
+#include <memalign.h>
 #include <linux/list.h>
 #include <div64.h>
 #include "mmc_private.h"
diff --git a/drivers/mmc/rpmb.c b/drivers/mmc/rpmb.c
index 9d0b8bc..1c6888f 100644
--- a/drivers/mmc/rpmb.c
+++ b/drivers/mmc/rpmb.c
@@ -10,6 +10,7 @@
 
 #include <config.h>
 #include <common.h>
+#include <memalign.h>
 #include <mmc.h>
 #include <u-boot/sha256.h>
 #include "mmc_private.h"