arm64: dts: exynos: gs101: add cmu_dpu and sysreg_dpu dt nodes

arm64: dts: exynos: gs101: add cmu_dpu and sysreg_dpu dt nodes

Enable the cmu_dpu clock management unit. It feeds some of the display
IPs. Additionally add the sysreg_dpu node which contains the
BUSCOMPONENT_DRCG_EN and MEMCLK registers required by cmu_dpu to enable
dynamic root clock gating of bus components.

Reviewed-by: André Draszik <andre.draszik@linaro.org>
Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Link: https://patch.msgid.link/20260113-dpu-clocks-v3-5-cb85424f2c72@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>