Fix inittab back to adding /proc, fops sketch, scripts to automate debugfs

rootfs_overlay/fops.sh

@@ -0,0 +1,12 @@
+#!/bin/sh
+set -ex
+insmod /fops.ko
+mkdir -p /fops
+mount -t debugfs none /fops
+cd /fops/kernel_module_cheat
+cat fops
+# => open
+# => read
+# => close
+# TODO.
+#echo a >fops