power: supply: Add property to vote for TLIM

Enable clients to vote for TLIM. It is used by
the VADC client to force the charger circuitry before
reading the charger temperature channel.

Change-Id: Id891b797f289d28ddb7ea2be95bd91365653cc02
Signed-off-by: Siddartha Mohanadoss <smohanad@codeaurora.org>