power: supply: qcom: Add support to make SMBLITE charger GKI compliant

SMBLITE charger drivers and their helper files use several power supply
properties on msm-4.19 which cannot be supported on msm-5.4 due to the
need for GKI compliance. Add support for main charger to register
as an IIO device with individual channels under it corresponding to
missing power supply properties from msm-4.19.

Change-Id: I397ed52d2fa822c7f93616090e15b109435d9657
Signed-off-by: Ashish Chavan <ashichav@codeaurora.org>