Revert "add mount point for internal storage"

This reverts commit 016d9266d0ba84b6d0d25be37061617ff44b1205.
This partially reverts commit 492b24deb1b84380ea47972873b673db55dbde73

Change-Id: Ib9368dcccd253d563a9998205ecc5a4fe7ab01e1
allow encryption of data partition

*include encyptable parameter on /data in fstab
*formatting /data in recovery leaves 16kb trailing for crypto footer
*setprop vold.post_fs_data_done or cryptfs will timeout and fail

Change-Id: Ie52c81629f72587533e8843622b78f2a0a4d9a0d