arm64: dts: qcom: sm8550: Drop redundant VSYNC pin state

arm64: dts: qcom: sm8550: Drop redundant VSYNC pin state

The active and suspend pin state of VSYNC is exactly the same, so just
use one node for both states.

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260310-qcom-dts-redundant-pins-v1-4-98e2ef430717@oss.qualcomm.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>