defconfig: sdm845: Remove config flag for File based Encryption

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

Changeset below is reverted, hence removal must be reflected
into defconfigs also.

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

Change-Id: I02210fe8c672f7431b4641bc2a413746792c6028
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>