from mt2701, the register of PAD_TUNE has been phased out,
while there is a new register of PAD_TUNE0
Signed-off-by: NChaotian Jing <chaotian.jing@mediatek.com>
Tested-by: NSean Wang <sean.wang@mediatek.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>