dt-bindings: soc: samsung: exynos-pmu: remove syscon for google,gs101-pmu

dt-bindings: soc: samsung: exynos-pmu: remove syscon for google,gs101-pmu

Since commit ba5095ebbc7a ("mfd: syscon: Allow syscon nodes without a
"syscon" compatible") it is possible to register a regmap without the
syscon compatible in the node.

Update the bindings for google,gs101-pmu so that the syscon compatible is
no longer required. As it isn't really correct to claim we are compatible
with syscon (as a mmio regmap created by syscon will not work on gs101).

Additionally (with the benefit of hindsight) PMU register writes were never
working with a MMIO syscon on gs101, so the ABI break is justified.

Signed-off-by: Peter Griffin <peter.griffin@linaro.org>
Acked-by: Rob Herring (Arm) <robh@kernel.org>
Link: https://patch.msgid.link/20251114-remove-pmu-syscon-compat-v2-1-9496e8c496c7@linaro.org
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>