ARM: dts: qcom: Update SPMI, PMIC device nodes for MDM9x07

Update the PMIC GPIO/RTC/ADC/thermal and SPMI nodes to align with
the requirement of 4.14 kernel which moves the PMIC from a
spmi-device to a platform device.

While at it, remove the standalone regulator definitions in pm8019.

Change-Id: I4e2665497cf8d756324972286ad8bed65989b920
Signed-off-by: Savitri Balagani <savitri@codeaurora.org>
Signed-off-by: Sivasri Kumar Vanka <sivasri@codeaurora.org>