arm64: dts: mediatek: mt2712: harmonize node names

This is used to fix dtbs_check warning.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20210316092232.9806-7-chunfeng.yun@mediatek.com


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