Revert "d710: build stage2 initramfs into kernel"

This reverts commit 45fc615a279c6c6614d74d9f85f9a69ef12886c2.
d710: build Cell Broadcast Receiver
Merge branch 'cm-10.1' of https://github.com/Team-Hydra/android_device_samsung_d710 into cm-10.1