arm64: dts: allwinner: h616: enable Mali GPU for all boards

arm64: dts: allwinner: h616: enable Mali GPU for all boards

All Allwinner H616/H618 SoCs contain a Mali G31 MP2 GPU.

Enable the DT nodes for that GPU, and specify the regulator providing
power to the VDD_GPU pins of the package. The rest of the DT node is set
by the SoC, so is not board specific.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Link: https://patch.msgid.link/20250416224839.9840-5-andre.przywara@arm.com
Signed-off-by: Chen-Yu Tsai <wens@csie.org>