arm64: dts: xilinx: 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' prefix.

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20200916155715.21009-8-krzk@kernel.org


Signed-off-by: Michal Simek <michal.simek@xilinx.com>