scsi: ufs: host: mediatek: Optimize power mode change handling

scsi: ufs: host: mediatek: Optimize power mode change handling

Optimize the power mode change process by skipping the adaptation
setting toggle if the requested power mode configuration is already
applied. This enhancement reduces unnecessary operations, improving
efficiency during power mode transitions.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Link: https://lore.kernel.org/r/20250811131423.3444014-8-peter.wang@mediatek.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>