FROMGIT: scsi: ufs: core: Export ufshcd_hba_stop()

Export ufshcd_hba_stop() to allow vendors to disable HCI in variant ops.

Bug: 191731858
Change-Id: I301836f74444a4def4483ae4a1c2105839a9ec85
(cherry picked from commit 3a95f5b3
git://git.kernel.org/pub/scm/linux/kernel/git/mkp/scsi.git for-next)
Link: https://lore.kernel.org/r/20210528033624.12170-2-alice.chao@mediatek.com


Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Alice.Chao <alice.chao@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>