ARM: dts: msm: update UFS regulator parameter for sdm855 platforms

Fixed UFS phy regulator parameters and set the UFS device regulator
voltage level to ~2.96v.

Change-Id: I0f3d41f7b1456ea6f2038f34ec3c15babf7a860e
Signed-off-by: Subhash Jadavani <subhashj@codeaurora.org>