ARM: dts: qcom: switch to I2C control of PM8008 PMIC regulators for Lahaina

Add support for managing the PM8008I and PM8008J chips via I2C.
Replace the stub-regulator device nodes for these PMICs with
subnodes inside of the respective I2C devices.  This ensures
that consumers are able to modify the physical state of these
PMIC regulators.

Change-Id: Ieb4976ecd8818c7515c2fbf61c754518215fd5bd