scsi: ufs: host: mediatek: Adjust clock scaling for PM flow

scsi: ufs: host: mediatek: Adjust clock scaling for PM flow

Adjust clock scaling during suspend and resume in the UFS Mediatek
driver. Ensure that the clock scales down during suspend if it was
scaled up, and scales up again after resume.  This adjustment maintains
proper power management.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Acked-by: Chun-Hung Wu <chun-hung.wu@mediatek.com>
Link: https://patch.msgid.link/20250924094527.2992256-3-peter.wang@mediatek.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>