ANDROID: Update init/do_mounts_dm.c to the latest ChromiumOS version.

This is needed for AVB integration work.

Bug: 31796270
Test: Manually tested (other arch)
Change-Id: I32fd37c1578c6414e3e6ff277d16ad94df7886b8
Signed-off-by: David Zeuthen <zeuthen@google.com>
Git-repo: https://source.codeaurora.org/quic/la/kernel/msm-3.18.git


Git-commit: 6a6a7657c231e947233c43ae0522bbd4edf0139e
[srkupp@codeaurora.org: Fixed klockwork error]
Signed-off-by: Srinivasa Rao Kuppala <srkupp@codeaurora.org>