Add binder and ashmem kernel drivers as out-of-tree modules

Based on code from https://github.com/hungys/binder-for-linux

kernel/ashmem/deps.c

@@ -0,0 +1,10 @@
+#include <linux/mm.h>
+
+#include "deps.h"
+
+static int (*shmem_zero_setup_ptr)(struct vm_area_struct *) = SHMEM_ZERO_SETUP;
+
+int shmem_zero_setup(struct vm_area_struct *vma)
+{
+    return shmem_zero_setup_ptr(vma);
+}