regulator: cpr3: Enable thread aggregation for CPR4 controller

Enable CPR thread aggregation regardless of which threads are
enabled or disabled. Also, disable threads in hardware that
are not used.

Change-Id: I969cb4b49d42577eca9902b1a26c71d40443efea
Signed-off-by: Tirupathi Reddy <tirupath@codeaurora.org>