arm64: dts: mediatek: mt8173: Add GPU device nodes

The MediaTek MT8173 comes with a PowerVR Rogue GX6250, which is part
of the Series6XT, another variation of the Rogue family of GPUs.

On top of the GPU is a glue layer that handles some clock and power
signals.

Add device nodes for both. While there is supposed to be two different
power domains to the GPU, MediaTek does not have any information on how
this is integrated internally. Assign the same GPU power domain to both.

Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Icenowy Zheng <zhengxingda@iscas.ac.cn>
Signed-off-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>

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