ARM: dts: msm: Make PMIC devices upstream spmi compatible

Update PMIC devices defined in pm8937.dtsi, pmi8937.dtsi and
pmi8940.dtsi files with upstream spmi configuration.

CRs-Fixed: 2160311
Change-Id: Ic58dc646998a00c3bf6c4d0fd3c63ac1d9dfd586
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>