Revert "scsi: ufs: refactor device descriptor reading"

This reverts commit be4d66d6.

[Sayali Lokhande]
Equivalent code delta is already presented on msm-4.9 as part of
commit [1]. There are few function/structure names different as
compared to the change which is reverted, but even that,
modifications are still doing the same thing.

Motivation to revert the change is because it is causing merge
conflicts on importing android-4.9.107 (42a730ad) into msm-4.9,
hence let's remove it before the merge.

[1] 344c16c9 scsi: ufs: read device descriptor once

Change-Id: I35d74c2663d98a9e5e8a4090f16e8054d2409896
Signed-off-by: Blagovest Kolenichev <bkolenichev@codeaurora.org>