power_supply: add CYCLE_COUNT_ID property

To support the bucket based cycle counters, we need a property
to specify the id of the cycle counter. For e.g. if the cycle
count for bucket 4 needs to be read, then the user need to
set cycle_count_id before reading the cycle_count property.

Add support for that via CYCLE_COUNT_ID property.

CRs-Fixed: 847140
Change-Id: I53d8b90d330da64b26b6a674f1d7c2c6649e4eb5
Signed-off-by: Subbaraman Narayanamurthy <subbaram@codeaurora.org>