ARM: dts: msm: enable CPUSS LDO mode on MSM8996v3 platforms

Update the LDO functional and retention scaling equations
to match the latest characterization data of msm8996v3
hardware and enable usage of LDO mode to reduce power consumption.

Change-Id: I575e5665f05511df46c385e079a6237e87d4a659
Signed-off-by: Osvaldo Banuelos <osvaldob@codeaurora.org>