arm64: dts: exynos: gs101: drop explicit regmap from reboot nodes

arm64: dts: exynos: gs101: drop explicit regmap from reboot nodes

The regmap property for syscon-poweroff and syscon-reboot is unneeded
here because the poweroff and reboot nodes are children of syscon
already. It also is deprecated.

We can just drop it to simplify the DT.

Reviewed-by: Peter Griffin <peter.griffin@linaro.org>
Signed-off-by: André Draszik <andre.draszik@linaro.org>
Link: https://lore.kernel.org/r/20250210-gs101-renppt-dts-v2-1-fb33fda6fc4b@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>