regulator: dt-bindings: qcom,rpmh: Update PMX65 entry

PMX65 does not have vdd-l18-supply separately and its
already part of vdd-l2-l18-supply property specified.
Updating this PMX65 dt-bindings entry accordingly.

Signed-off-by: Rohit Agarwal <quic_rohiagar@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/1689062414-3654-2-git-send-email-quic_rohiagar@quicinc.com


Signed-off-by: Mark Brown <broonie@kernel.org>