scsi: ufs: disable clocks all the time when autohibern8 supports

Matched with Pixel-4.19, we can disable clocks and links if autohibern8 is on.
The patch fixes power regression, 10~15mW, caused by the below two patches.

Bug: 151181812
Fixes: 92967c0c2ecb "scsi: ufs: set autohibern8 timer regardless of hibern8_on_idle"
Fixes: 5a57ae46dd6f "scsi: ufs: disable hibern8_on_idle"
Signed-off-by: Jaegeuk Kim <jaegeuk@google.com>
Change-Id: I00fe1add360922559d7e227ef630f34d04a42958