ARM: dts: qcom: msm8960-cdp: drop unit ids from regulator node

Drop the unused unit id from the gpio-regulator node, there is no
addessing scheme in the /regulators node.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220930185236.867655-19-dmitry.baryshkov@linaro.org