msm: kgsl: Add Battery Current Limiting support for A6xx

Battery Current Limiting (BCL) prevents voltage droops and peak currents
on battery packs preventing under voltage lockout and over current.

Change-Id: Ie6c3753bbe21a801b9c6ee1ac9aec03c0de156b7
Signed-off-by: Mohammed Mirza Mandayappurath Manzoor <mmandaya@codeaurora.org>