ANDROID: dm: Mounting root as linear device when verity disabled

This CL makes android-verity target to be added as linear
dm device if when bootloader is unlocked and verity is disabled.

Bug: 27175947

Change-Id: I8c73f2b3597d8b33f6306e3e85da53fcaacade87
Signed-off-by: Badhri Jagan Sridharan <Badhri@google.com>
Git-commit: 03a54be6
Git-repo: https://git.linaro.org/kernel/linux-linaro-stable.git


Signed-off-by: Imran Khan <kimran@codeaurora.org>