ARM: dts: msm: Update VADC nodes for pm8953

Update VADC channel nodes to support clients to measure
voltage power and thermal clients to read system thermistors for pm8953.

Change-Id: I4b7bad1e74812d4d036c990b73ecc8a30baecc87
Signed-off-by: Ashok Jammigumpula <jashok@codeaurora.org>