of: batterydata: Add support to get best battery profile based on age level

To support multiple battery profile with same battery id but
with different age level, add a function to select best profile
based on battery id and age level.

Change-Id: I4193529744b1efa342939008de0a9a55b3ca389a
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>