dev: pm8x41: Re-write the enable mpp as ADC api

Previous API can not meet the requirements now, add the sid support
for 8952 pmic/pmi.
In the mean time, fix a minor bug regarding AMUX configuration.

CRs-Fixed: 860605
Change-Id: I262267a9d168ad78d1a947229a9b0ad75b6dfe5e
2 files changed