scsi: ufs: host: mediatek: Support new features for MT6991

scsi: ufs: host: mediatek: Support new features for MT6991

Add support for the MT6991 platform by enabling MRTT settings and random
performance improvements. These enhancements aim to optimize performance
and efficiency on the MT6991 hardware.

Enable multi-Round Trip Time (MRTT) for improved data handling.  Enable
random performance improvement features to boost overall system
responsiveness.

Signed-off-by: Naomi Chu <naomi.chu@mediatek.com>
Reviewed-by: Peter Wang <peter.wang@mediatek.com>
Acked-by: Chun-Hung Wu <chun-hung.wu@mediatek.com>
Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Link: https://patch.msgid.link/20250924094527.2992256-9-peter.wang@mediatek.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>