ARM: dts: msm: add proxy consumers for L2B and L1C regulators on Lahaina

Add proxy consumer configurations for PM8350 LDO 2 and PM8350C LDO 1
which ensure that these regulators are kept enabled in high power
mode until all consumers have a chance to make their own requests.

This is needed to ensure that EUD remains operational until USB
software receives notification from ADSP charger firmware that a
USB cable is connected or not.

Change-Id: Iec24f13ddb96b2023ca71cf16456bbf189b89387