Revert "security: pfk: Error code was overwritten"

This reverts commit c23efa56.

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: Iadb627691de77c195eb8644b2e9329ed9b764d64
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>