scsi: ufs-mediatek: fix ufs power down specs violation

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As per specs, e.g, JESD220E chapter 7.2, while powering off
the ufs device, RST_N signal should be between VSS(Ground)
and VCCQ/VCCQ2. The power down sequence after fixing as below:

Power down:
1. Assert RST_N low
2. Turn-off VCC
3. Turn-off VCCQ/VCCQ2


 drivers/scsi/ufs/ufs-mediatek.c |    4 ++++
 1 file changed, 4 insertions(+)



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