ARM: dts: qcom: msm8960: drop unit ids from PMIC nodes

On MSM8960 the PMICs are connected using SSBI devices, which do not have
any addressing scheme. Drop the unused unit ids from PMIC device nodes.

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/20220930185236.867655-17-dmitry.baryshkov@linaro.org