ARM: dts: msm: Update VADC calibration type for pmtitanium

Update the calibration type for pa_therm, xo_therm VADC channels
on pmtitanium.

Change-Id: I1153e56be7a2e08c0bdc5339c17d6619c035b688
Signed-off-by: Rama Krishna Phani A <rphani@codeaurora.org>