fstab: remove length parameter for encryption

* This is not needed and actually causes encryption to fail
  most of the time.

Change-Id: I4020a759249efbbd92e0d13acae15058dd20ac9e
Merge branch 'cm-11.0' of https://github.com/CyanogenMod/android_device_samsung_msm8960-common into android-4.4