Revert "add mount point for internal storage"

This reverts commit 533ae3874e4ef6de368427aea1ab7f1e90ad7d96.
This partially reverts commit b1d6abb0b9ee41176c137df42ff8dfbe95050460

Change-Id: If9c252bd94e1cf80aff56627fd42d9576f972035
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
add libaudio

Change-Id: I13ade78bdbbecc8ec7e9c6a745f7390dc6008581