ARM: dts: qcom: add ECM device for PM8350B

Add AMOLED ECM (Embedded Current Measurement) device for PM8350B
to measure display current for OLED panels that is used on Lahaina
platforms. Also, add the necessary SDAM devices in PMK8350 for
ECM to be functional.

Change-Id: I2ee2cec85c6a75fef443713fbe04e86e095c0ce1