power_supply: Add "THERM_ICL_LIMIT" property

Add "THERM_ICL_LIMIT" property to allow userspace
thermal throttling algorithm to control input current
limit of charger.

Change-Id: Ib527712b3dc5cde3555813c26f1a4b3a10b23cc1
Signed-off-by: Ashay Jaiswal <ashayj@codeaurora.org>
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>