restore: Align stack to 16 bytes for arm64

arm64 expects stack to be aligned to 16 bytes.
If stack pointer is not aligned clone system call
fails during restore.
Signed-off-by: Vijaya Kumar K <vijayak@caviumnetworks.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-check.c

@@ -808,7 +808,7 @@ struct clone_arg {
 	 * Reserve some space for clone() to locate arguments
 	 * and retcode in this place
 	 */
-	char stack[128] __attribute__((aligned (8)));
+	char stack[128] __attribute__((aligned (16)));
 	char stack_ptr[0];
 };
 

cr-restore.c

@@ -1075,7 +1075,7 @@ struct cr_clone_arg {
 	 * Reserve some space for clone() to locate arguments
 	 * and retcode in this place
 	 */
-	char stack[128] __attribute__((aligned (8)));
+	char stack[128] __attribute__((aligned (16)));
 	char stack_ptr[0];
 	struct pstree_item *item;
 	unsigned long clone_flags;