scsi: ufs: host: mediatek: Fine-tune clock scaling

Disable clock scaling for UFS versions below 4.0. Clock scaling is
unnecessary for these versions, and this change ensures that the feature
is only enabled for compatible UFS versions.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Link: https://lore.kernel.org/r/20250811131423.3444014-5-peter.wang@mediatek.com


Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>