FROMGIT: scsi: ufs: Put HBA into LPM during gating

During clock gating, after clocks are disabled, put HBA into LPM to save
more power.

Bug: 172066868
(cherry picked from commit dd7143e2
https://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git staging)
Link: https://lore.kernel.org/r/52198e70bff750632740d78678a815256d697e43.1603825776.git.asutoshd@codeaurora.org


Reviewed-by: Avri Altman <avri.altman@wdc.com>
Acked-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Can Guo <cang@codeaurora.org>
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Change-Id: I3c7b627fdf485b5f79eb3e4d1bd6a175b97ada7d
Signed-off-by: Asutosh Das <asutoshd@codeaurora.org>