scsi: ufs-mediatek: Make ufs_mtk_fixup_dev_quirks static

Fix the following warning:

drivers/scsi/ufs/ufs-mediatek.c:585:6: warning:
symbol 'ufs_mtk_fixup_dev_quirks' was not declared. Should it be static?

Link: https://lore.kernel.org/r/20200514012655.127202-1-chentao107@huawei.com


Reported-by: Hulk Robot <hulkci@huawei.com>
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: ChenTao <chentao107@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>