power: qpnp-bms: read battery data

Read in battery data from the batterydata-lib API for future use.

Currently, the battery data isn't used for anything, and battery-id
reading is not yet supported.

Change-Id: Id2169e24c23c1e180bbf8c8c7f467f599df1640c
Signed-off-by: Xiaozhe Shi <xiaozhes@codeaurora.org>