ARM: dts: msm: update CPUSS LDO mode Vref scaling equations for msm8996v3

Update the LDO functional and retention scaling equations to
match the latest characterization data of msm8996v3 hardware.
This is necessary to ensure stable operation across all parts
when using DCVS set points that enable active LDO mode.

Change-Id: Ia338126a4290c56c9c9fc5d95f03f2e77fba8281
Signed-off-by: Osvaldo Banuelos <osvaldob@codeaurora.org>