Revert "Revert "qcom: allow properly querying of battery capacity""

This reverts commit cc86d21421216314effb8154fc57e2ce1de5530d.

Change-Id: I93c1bfcf8cbd837f4593d33040c6538ab7957935
Merge "Revert "Revert "qcom: allow properly querying of battery capacity""" into kk4.4