arm64: dts: mt8173: fix property typo of 'phys' in dsi node

Use 'phys' instead of 'phy'.

Fixes: 81ad4dba ("arm64: dts: mt8173: Add display subsystem related nodes")
Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Reviewed-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>
Cc: stable <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20210316092232.9806-5-chunfeng.yun@mediatek.com


Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>