arm64: dts: mediatek: align GPIO hog names with dtschema

The convention for node names is to use hyphens, not underscores.
dtschema for pca95xx expects GPIO hogs to end with 'hog' suffix.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201002163940.7837-1-krzk@kernel.org


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