dt-bindings: msm/dsi: Don't require vdds-supply on 10nm PHY

dt-bindings: msm/dsi: Don't require vdds-supply on 10nm PHY

On some SoCs (hello SM6350) vdds-supply is not wired to any smd-rpm
or rpmh regulator, but instead powered by the VDD_MX/mx.lvl line,
which is voted for in the DSI ctrl node.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Acked-by: Rob Herring <robh@kernel.org>
Fixes: 8fc939e72ff8 ("dt-bindings: msm: dsi: add yaml schemas for DSI PHY bindings")
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Patchwork: https://patchwork.freedesktop.org/patch/511889/
Link: https://lore.kernel.org/r/20221116163218.42449-1-konrad.dybcio@linaro.org
Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com>