The MT8173 eval board contains a MT6397 PMIC. This adds the
corresponding device node to the dts file.
Signed-off-by: NHenry Chen <henryc.chen@mediatek.com>
Signed-off-by: NEddie Huang <eddie.huang@mediatek.com>
Signed-off-by: NMatthias Brugger <matthias.bgg@gmail.com>