Revert "Enable HW File Based Encryption on ext4 file system"

This reverts commit 7b939265.

This is temporary due to hard conflicts against android-4.9.84.

Intake is switched from android-4.9-o to android-4.9 with LSK
tag 4.9.84 and more time is needed to rework the FBE changeset
[1] according to the new upstream changes coming from
android-4.9.

[1] c23efa56 security: pfk: Error code was overwritten
    7b939265 Enable HW File Based Encryption on ext4 file system

Change-Id: I6b539a549fe0016339558025807910c3946f1daf
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>